These 10 Deals Are the Best Kept Secrets at Costco, According to Shoppers

If you've ever left Costco with more than you planned, you're not alone. Between the free samples, bulk pricing, and rotating treasure-hunt items, it's a budget-friendly shopping adventure. The trick is knowing which finds deliver enough quality and value to make your membership pay off.

But beyond the popular basics lies a hidden layer of cult favorites, products so beloved by regulars they're whispered about on Reddit and buried in five-star reviews.

Below, we have uncovered the best-kept secrets at Costco. These aren't your usual rotisserie chickens or five-pound peanut butter tubs; they are the brilliant, often-overlooked items and great Costco hacks that smart shoppers swear by.

Editor's note: Prices and availability are subject to change and may vary by location and online.

Price: $9.99

Shoppers say this pesto rivals the kind you'd get at a high-end Italian restaurant, and it's made in Italy with Genovese basil and real Grana Padano cheese.

Make every penny count with this Costco steal that is only 45 cents per ounce, compared to Rao's Homemade Basil Pesto at nearly 68 cents per ounce.

The 22-ounce jar gives you plenty to work with, making it a practical pick for households that use pesto regularly. Toss a spoonful with pasta, spread it on sandwiches, or use it to dress roasted vegetables for an easy flavor upgrade. You can also stir it into soups or use it as a quick marinade for chicken.

Because pesto is rich and flavorful, a little can go a long way. Keep the jar refrigerated, and freeze portions you won't use soon to help reduce waste. Buying a larger jar can be especially worthwhile when it replaces smaller, more expensive specialty sauces.

Price: $1.50

The food court favorite has held its price for decades and remains one of the best values around. For just $1.50, you get a jumbo dog and a refillable soda. It is no wonder it's practically a rite of passage for Costco shoppers.

It's also a convenient way to grab an inexpensive lunch while shopping, especially when restaurant meals can quickly add up for a family. At $1.50 per combo, two people can eat for just $3 before tax, making this an easy budget win.

The food court's simple offering is a reminder that Costco's value isn't limited to bulk groceries and household supplies. Just remember that the combo is a perk to enjoy when you're already visiting, not a reason to make an unnecessary trip. Keeping your spending focused on items you need is still the best way to make your membership worthwhile.

Price: $22.69

Aged for 24 months and imported directly from Italy, these Parmesan wedges have a nutty, complex flavor that foodies rave about. They're perfect for grating over pasta, snacking on with wine, or spicing up your next charcuterie board.

The extended aging gives this cheese a savory flavor that can make simple meals feel a little more special. Grate it over risotto, roasted vegetables, salads, or homemade pizza, or shave thin pieces over a bowl of soup. You can also use the rind to add flavor to simmering soups and sauces rather than throwing it away. That helps you get more value from a premium ingredient.

Costco's larger cheese portions can be particularly appealing if you cook often or entertain guests, since you can use the cheese across several meals instead of buying multiple smaller packages at grocery-store prices.

Price: $57.99

This full synthetic motor oil meets the same standards as many premium brands, but it's sold in bulk at a fraction of the cost. One reviewer named Benjamin praises it, saying that the "oil is great and the price is amazing."

The package contains two five-quart containers, giving you 10 quarts for routine maintenance or future oil changes. That bulk format can help drivers save compared with buying individual containers, especially if their vehicle requires frequent oil changes and the oil meets its specifications.

Before purchasing, check your owner's manual for the required viscosity and performance standards. Using the wrong oil can cost you more in the long run, so compatibility matters just as much as the price tag. For drivers who do their own maintenance, buying a larger supply can also mean fewer trips to the auto parts store.

Price: $20.99

Praised by chefs and home cooks alike, this cold-pressed olive oil is a kitchen staple. It consistently ranks high in blind taste tests and is much cheaper than comparable boutique brands like Pompeian.

The two-liter bottle offers a generous supply for people who cook at home regularly. Use it to sauté vegetables, prepare salad dressings, drizzle over roasted potatoes, or finish pasta and soups. Because it's extra virgin olive oil, it also works well in recipes where its flavor can stand out rather than disappear into the background.

Costco's larger format can help households avoid repeatedly buying smaller bottles, which may cost more per ounce. Store the oil away from direct sunlight and heat to help preserve its quality.

Price: $20.99

Shoppers swear this detergent outperforms national brands like Gain and Tide in quality. It's highly concentrated, effective in both hot and cold water, and comes in eco-friendly packaging.

Several nurses have left reviews on this product, saying they are "impressed with how clean our clothes are with Kirkland Ultraclean laundry detergent."

Laundry detergent is a household expense that's easy to underestimate because it needs replenishing so often. Buying a larger supply at Costco can help reduce the cost of repeated grocery-store trips, particularly for families tackling several loads each week.

To get the best value, follow the dosing instructions rather than pouring in extra detergent, which can waste product without making clothes cleaner. If the detergent works well for your household, sticking with a reliable store-brand option can help keep routine laundry costs in check.

Price: $9.99

Looking for salon-style hair care without the salon-brand price tag? Kirkland Signature Moisture Shampoo is often compared to Paul Mitchell shampoo, which costs around $28 per bottle. At just $9.99, this Costco find could help you save on a bathroom staple you use regularly.

The shampoo is sulfate-free and cruelty-free, making it worth considering if those features matter to you. It has also received plenty of positive shopper reviews.

Instead of automatically reaching for a pricier brand when your bottle runs out, try this budget-friendly alternative to see how it works with your hair-care routine. Use as directed, focusing on your scalp and rinsing thoroughly.

Price: $9.99

Pure vanilla extract can be pricey, but Costco's version delivers exceptional quality in a large bottle that lasts for months. Many bakers claim it tastes better than the fancy boutique brands, and customers claim that it is a "very nice quality product at a great price."

The 16-fluid-ounce bottle is especially useful for people who bake regularly, from weekend cookie makers to anyone preparing cakes and desserts for gatherings. A splash of vanilla can enhance the flavor of brownies, muffins, pancakes, frosting, and homemade whipped cream. You can also add it to coffee drinks or overnight oats for a little extra flavor.

Since pure vanilla extract can be expensive in small bottles, buying a larger quantity may lower the cost per ounce and save you from frequent replacements. Just keep the bottle tightly closed and store it in a cool, dark place to protect its flavor.

Price: $12.99

This 100% pure Grade A syrup is tapped in Canada and comes in a large glass bottle. It's far cheaper than most brands found at traditional grocery stores, making it a pantry essential for many households.

The 33.8-ounce container provides plenty of syrup for more than weekend pancakes. Drizzle it over waffles, oatmeal, or yogurt, or use it to sweeten homemade granola and marinades.

Because it's pure maple syrup, it offers a different flavor from pancake syrups made with other sweeteners. The larger bottle can be a worthwhile buy for households that use maple syrup regularly, especially when smaller bottles at the grocery store run out quickly.

To get the most from your purchase, refrigerate the syrup after opening and follow the storage directions on the label. That helps preserve your investment instead of letting a good pantry find go to waste.

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Price: $36.99

These long-lasting, energy-efficient bulbs are another sleeper hit. Bundled in bulk, they offer exceptional brightness and durability, plus, they help reduce your electric bill over time and keep more cash in your wallet.

One customer named Alan says, "You'll love these bulbs and the price is right."

Buying multiple bulbs at once can be a smart move if you're replacing lights throughout your home. LED bulbs use less electricity than traditional incandescent bulbs and generally last longer, which can help reduce both energy costs and replacement expenses.

To make sure you get the right deal, check the package for the number of bulbs, brightness in lumens, color temperature, and compatibility with your fixtures. Warm white bulbs can create a cozy atmosphere in bedrooms and living rooms, while cooler light may work better in workspaces. Replacing frequently used lights first can help you see the benefits on your electric bill without spending money to change every bulb at once.

While Costco is famous for its bulk savings and popular staples, the real thrill comes from discovering those hidden gems regular shoppers already know and love. From imported delicacies to surprisingly luxurious basics, these under-the-radar finds offer serious value.

Costco also rotates some of its best secret deals seasonally or regionally, so what's available now might not be there next month. Savvy shoppers who want to save on groceries know to act fast when they spot these treasures.

The best strategy is to focus on products you'll actually use, then compare unit prices with what you'd pay elsewhere. A larger package isn't automatically a bargain if some of it goes to waste, but pantry staples, cleaning supplies, and frequently used household items can offer meaningful savings when bought in bulk.

Keep an eye on prices, too, since warehouse and online costs can differ. With a little planning, Costco's lesser-known finds can help you get more for your money without filling your cart with things you don't need.