15 Best Deals in the Costco August-September Coupon Book

We all know that groceries and household essentials can get expensive, especially if you don't know where to find savings. The good news is you can buy plenty without overspending. It just takes knowing where to look.

Costco is one of the best places to stretch your budget, and the smartest shopping hack at the big box retailer is to look out for the monthly coupon book. The book hits mailboxes each month and is filled with unbeatable deals on some of the most popular items.

Here are the best deals from the August-September coupon book, valid through Sept. 21.

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

Price: $24.99 (on sale from $29.99)

Get ready for flu season by stocking up on a pack of Vicks DayQuil and NyQuil Severe Cold & Flu LiquiCaps with Costco's $5 off coupon. The pack comes with one bottle of DayQuil and two bottles of NyQuil, each 12 ounces.

With a two-pack costing $28.99 at Walgreens, you won't want to miss the Costco deal.

Price: $10.49 (on sale from $14.49)

Get $4 off MadeGood Organic Granola Bites this month. These healthy bites are a grab-and-go snack made with organic ingredients and no major allergens, perfect for sustaining hunger between meals.

With 24 total pouches, you can choose between either Mixed Berry or Chocolate Chip in each pack.

Price: Price varies (on sale from $35.99)

With Costco's coupon book, a two-pack of Kirkland Signature Motor Oil is $6-$8 off, depending on the type. That means you could be paying as little as $27.99 for your vehicle.

Each bottle contains five quarts and is made for extended engine life. With Walmart selling five quarts of Valvoline 5W-30 Synthetic Motor Oil for $29.97, it's well worth stocking up on at Costco instead.

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Price: $33.99 (on sale from $39.99)

With the Costco coupon book, you can get $6 off 24 ounces of Vital Proteins Collagen Peptides. It is a popular supplement for joint, bone, and skin health that mixes easily into morning coffee or soups. Plus, it's free of gluten, dairy, and soy, so it's ideal for many diets.

With over 17,000 5-star reviews, customers rave about the effectiveness of the collagen powder, too. "My hair seems fuller, my nails seem stronger and my skin seems clearer and brighter. The big difference is in my joints, even my knees," said reviewer MizB.

Price: $29.99 (on sale from $34.99)

The Swiffer Sweep + Mop Deluxe Sweeping Kit is $5 off with the Costco coupon book. It comes with a sweeper mop and 30 refills: 15 for heavy duty dry sweeping and 15 for heavy duty wet mopping.

A similar item, the Swiffer Sweep + Mop Deluxe with only 11 refills, costs $43.99 at Walmart, making Costco the place to go for the most savings.

Price: $19.99 (on sale from $23.99)

Four dollars off 170 fluid ounces of Gain + Oxi HE Liquid Laundry Detergent makes it an affordable way to tackle the chore. The detergent is made to lift away dirt and wash 159 loads of laundry.

The same product costs $33.99 at Walmart, making it a smart idea to opt for Costco while the coupon book is valid.

Price: $17.29 (on sale from $22.99)

​At $5.70 off when using the Costco coupon, this 18-count of Robert Irvine's FITCRUNCH Chocolate Peanut Butter Baked Protein Bars is a deal you won't want to miss. These baked bars contain 15 grams of protein for a healthy treat that's also gluten-free and naturally flavored.

Price: $11.99 (on sale from $15.99)

A five-pack of Crest Complete + Scope Advanced Active Foam Toothpaste contains 35% more whitening power and is $4 off with the Costco coupon this month. That makes each tube cost only $2.40, while a single Crest + Scope Complete toothpaste costs $3.99 at Target.

Price: $35.99 (on sale from $43.99)​

It doesn't get better than $8 off this two-pack of Metamucil Fiber when you use the Costco coupon book. You can choose between sugar-free and real sugar, and the supplement is made with psyllium husk, a natural fiber that works to promote digestive health.

With a single container costing $24.49 at Target, this is a Costco deal you won't want to miss. 

Price: $12.49 (on sale from $15.99)

A 40-count box of Pirate's Booty Cheddar Puffs is $3.50 off with the Costco coupon. This delicious snack is gluten-free and doesn't contain any artificial colors, flavors, or preservatives.

Walmart sells the same product for $22.30, so you'll save significantly by picking it up at Costco, even when it's not on sale.

Price: $13.99 (on sale from $17.99)

​After a $4 coupon, the 32 Degrees Women's Softshell Jacket at Costco costs only $13.99. With a soft fleece lining and two side pockets, it's the perfect pick for cooler weather. You can choose from green, cream, or black, and it comes in sizes X-Small to 3X.

Price: $27.49 (on sale from $33.99)

​Using Costco's coupon book, you can get $6.50 off a 30-pack of Charmin Ultra Strong Bath Tissue. Not only is it two-ply for extra strength, but it's wider than regular rolls and comes with 220 sheets per roll, too.

Price: $26.49 (on sale from $33.99)

It's never too early to start stocking up for Halloween, and a 30-pack of full-size chocolate bars is $7.50 off if you use Costco's coupon book.

The box features eight Snickers, seven Twix, six M&M's Peanut, five M&M's Milk Chocolate, and four Milky Way candy bars. It's made to satisfy any sweet tooth.

Price: $37.99 (on sale from $47.99)

Ten dollars off a 72-count of Keurig Crafted Classics K-Cup Pods is a Costco coupon deal you'll want to snag immediately. Use the coupon on French Roast, Holiday Blend, or Pike Place Roast and get each pod for only 53 cents.

Target sells the same Starbucks K-Cup Pods for $18.29 (or 83 cents each), but you'll only get 22 pods.

Price: $12.49 (on sale from $16.99)

After a $4.50 Costco coupon, this Head & Shoulders 2-in-1 Advanced Scalp Care Shampoo and Conditioner costs less than $13. The product is made to nourish your scalp and hair and is free of phosphates, dyes, and parabens.

Customers love the 2-in-1 shampoo and conditioner too, with one sharing that it's the "Best shampoo out there. H&S always saves me from an itchy scalp. Besides it smelling great, it leaves hair super silky."

With deals valid Aug. 25 – Sept. 21, the August-September Costco coupon book is full of amazing items, so you can stock up without overspending.

These aren't the only ways to save money at Costco, either. Another smart way to save money is to buy your favorite items in bulk so they last longer and cost less per unit. While specific savings can vary, you could save anywhere from 25% to 50% by buying in bulk at Costco.