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12 Dreadful Costco Mistakes You Never Want to Make (#6 Is Hard to Avoid)

If you're looking to save more money at Costco, make sure you avoid making these mistakes again.

Costco Wholesale entrance store Sarcee Calgary
Updated March 12, 2026
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Heading to Costco with a plan to save big? While it's a great place for deals, it's easy to slip into habits that can end up costing you more than you bargained for.

If you're aiming to get the most out of your Costco membership, steer clear of these 12 rookie mistakes many shoppers make. Avoiding these pitfalls will put you well on your way to maximizing savings on every Costco run.

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Skipping the food court

Eric BVD/Adobe Costco Food Court Menu

Costco doesn't just help you save money shopping. Costco's food court is a great option for a cheap meal before you head home.

Check out their famous hot dog deal for $1.50, or you can also put in an order before you start shopping so that it's ready when you leave. For example, place an order for a pizza and pick it up hot when you're heading out.

Missing the price adjustment

dennizn/Adobe costco receipt and membership card

It can be annoying when you buy something and see that Costco put that same item on sale a week later. But you can still save money if you're proactive. 

Costco has a price adjustment feature that will allow you to get the sale price on an item if you mention it within 30 days of purchase. Check with the Costco customer service desk to see if you can get the price change, or request an adjustment online.

Not checking the ad booklet before shopping

trongnguyen/Adobe champagne Liquor aisle inside Costco Alaska

Costco sends out an ad booklet each month that lists all kinds of savings on food, home products, electronics, clothes, and more. This is a great Costco hack if you take advantage of it. 

Make sure to check this out. You might find a good deal on something you have been thinking about buying, so make sure you grab an ad booklet on your next run.

Not having the right membership

andy/Adobe Costco wholesale warehouse shopping membership card

Costco has three different membership options, and choosing the wrong one can cost you money.

Costco's Gold Star membership and Business membership each cost $60 per year. The Executive Membership is $120 per year with 2% cash back on your purchases. Do some math and see which one is best for you.

Shopping while hungry

dennizn/Adobe A hand holding a Costco Membership card on a cart

Costco is full of delicious foods, which is why it's risky to shop at the warehouse retailer on an empty stomach. Instead, go after you've had a meal.

Make sure you create a list and stick with it so you don't get tempted by the food in the aisles.

Shopping on a Sunday

Cris C./Adobe view of Costco wholesale store

Sometimes, it's not about the money you spend but rather the time you waste. So, if you want to get in and out of Costco as quickly as possible, don't waste your Sunday at the warehouse retailer.

Lines will be long, aisles will be crowded, and you might have to fend off other shoppers to get the best samples. Skip the stress and enjoy your Costco trip on another day or at a less busy time.

Dismissing Kirkland Signature products

Sundry Photography/Adobe branded Costco Wholesale trucks driving on the freeway

It's a mistake to automatically assume that Kirkland Signature products are not as good as name-brand items. Items with this Costco brand are usually good in quality, and they could save you cash.

Overdoing the fresh produce

mandritoiu/Adobe Fresh produce cold room

Costco shoppers can be overly ambitious. That's not a problem if you're stocking up on pasta or grabbing extra paper towels for the family. But Costco's bulk-size produce options may cost you cash if you don't eat them quickly.

Think about your produce purchases before you put them in your cart so you don't end up disposing of them if they go bad before you eat them.

Missing those member perks

andy/Adobe Costco wholesale warehouse shopping membership club

Buying in bulk isn't the only great thing about having a Costco card: Your membership can also get you discounts on travel, cars, insurance, and other products.

Dig into Costco's various perks and see if there is something online that might save you money.

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Shopping pro tip: This month's best deals

methaphum/Adobe person holding a wallet

January is here, bringing fresh starts, clean slates, and a renewed focus on routines. As the new year kicks off, so do savings, making it the perfect time to reset your space and budget with smart seasonal buys. Look for deals on:

  • Fitness gear, wellness products, and activewear
  • Home organization essentials
  • Cold-weather basics, like coats, boots, and cozy layers
  • For grocery savings, look for seasonal produce, including citrus fruits, leafy greens, and root vegetables

With post-holiday markdowns and a shift toward fresh priorities, January is a great time to shop smart, stock up, and set the tone for a well-prepped year ahead.

Driving past the pump

Andriy Blokhin/Adobe petroleum at Costco store

Don't drive by those gas pumps in the Costco parking lot. The pumps at Costco often have lower prices than many local gas stations. So, fueling up at Costco can save you money on gas.

Missing the pharmacy deals

sofiko14/Adobe male pharmacist using digital tablet during inventory

Costco's pharmacy can fill your prescriptions just like your normal pharmacy, and the cost may be lower at the warehouse retailer.

The pharmacy also has various generic drugs at a discounted price, which may help you save money. And remember your furry friends, you can also get dog and cat medication from Costco.

Forgetting the seasonal items

wip-studio/Adobe wheelbarrow with gardening tools in the garden

Costco has some great deals on seasonal items for holidays in the winter, gardening in the spring, and other events during the year. Check for things that you need when these seasons roll around.

Quick tips: How to save on your grocery bill

Arnell Koegelenberg/peopleimages.com/Adobe woman using smartphone at grocery store

Grocery shopping doesn't have to break the bank when you use the right strategies. Here are three quick tips for reducing food expenses:

  • Buy store brands instead of name brands whenever possible.
  • Always make sure to compare unit prices, not just sticker prices.
  • Join your store's loyalty program so you don’t miss out on member discounts.

Even though something like choosing coupons in your grocery store app can feel like an annoying task, the savings can really add up.

Bottom line

trongnguyen/Adobe Meat in cooler at Costco

You can save a lot of money as a Costco member, particularly if you know how to unlock the power of your Costco membership. For one, avoiding the above mistakes will help you keep even more cash in your pocket.

Before you head out, check your wallet for the best cash back credit cards for shoppers. Then, look for sales and in-store brands to get extra savings.

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