14 Remarkable Kirkland Signature Deals at Costco This September (All Under $40)

Costco is known for its bulk purchases that help you save money on your favorite brands. However, the biggest deals often come with the warehouse's own personal Kirkland Signature label. From nutritional supplements to essential fall wardrobe additions, Costco's house brand offers unbeatable value on everyday essentials and more.

Consider these 14 remarkable Kirkland Signature finds in September, all for less than $40 each.

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

Price: $35.49 (on sale from $42.99)

Turmeric is a natural supplement that helps fight inflammation caused by daily activities. Each pill contains 1,000 milligrams of turmeric root extract with 10 milligrams of black pepper to help with absorption.

Adding turmeric to your diet is a cost-effective way to support joint health and maintain mobility. At $7.50 off, you'll want to stock your medicine cabinet.

Price: $9.99

Whether you're lactose intolerant or simply looking for an alternative to dairy milk, this Kirkland Signature Organic Almond Beverage is ideal for adding to your coffee or drinking straight from the carton. It's unsweetened and has a natural vanilla flavor.

Each pack contains six cartons, making this a smart purchase at just 5 cents an ounce.

Price: $19.99

Why spend extra money on brand-name laundry detergent when you can keep your clothes fresh and clean with Kirkland Signature's UltraClean HE Liquid Laundry Detergent? It's hypoallergenic yet tough on stains for just 14 cents per load.

Some Costco customers compare this detergent to all. It's also safe for use in HE washing machines.

Price: $21.99

If you're looking for an affordable, classic style, these Kirkland Signature 3/4-sleeve slub tees come in a two-pack that can be dressed up or down. They are made from 100% cotton, making them soft enough for layering on cold days.

At just under $11 a shirt, these tees are an excellent way to fill your closet for less.

Price $14.49

Kirkland Signature's plant-based bar soap is made with sustainable palm and coconut oil, along with 5% shea butter to keep skin clean and soft. You'll get 15 bars per pack, which works out to 97 cents per bar.

Customers love the fresh, clean scent and claim it works better than well-known brands, which could cost you around $1.15 per bar.

Price: $15.99

It's always good to have plenty of batteries on hand in case of an emergency. Kirkland Signature Alkaline AAA Batteries cost roughly 33 cents each, which is comparable to Duracell batteries, which cost around 50 cents each.

Kirkland Signature batteries are known for their long life and affordability, which is important when powering things like blood pressure monitors and hearing aids.

Price: $15.99 (on sale from $18.99)

Digestive health affects your well-being and overall health, and adding fiber to your diet is one way to ensure everything moves smoothly. Kirkland's Signature Optifiber is just 8 cents per dose, which is about 6 cents less than name-brand Benefiber.

This smart buy is an excellent way to maintain your health without overspending on supplements.

Price: $13.69

If you prefer to cook with almond flour or have a gluten allergy, you can save money by purchasing in bulk from Costco. The flour is an excellent source of protein and perfect for a low-carb diet. Major grocery stores charge as much as $8.99 a pound. At Costco, you'll pay $4.56 a pound.

Customers say the flour has a great taste and is easy to work with.

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Price: $18.99 (on sale from $22.99)

With the arrival of fall comes an increase in mold spores due to decaying leaves, which can make allergies worse for some. Kirkland Signature Aller-Flo Nasal Spray provides 24-hour allergy relief in a non-drowsy formula, making it easier to stay active while addressing symptoms.

The manufacturer is offering $4 off through September 21, so you can save even more on Costco's already low price.

Price: $26.49

Adding more protein to your daily diet can help curb your appetite, increase your muscle mass, and may make it easier to lose weight. Each bar contains 21 grams of protein and contains real chocolate.

At $1.33 each, these bars offer an affordable on-the-go snack to toss in your lunchbox or purse.

Price: $20.99

With 200 bags per box, these trash bags will last the better part of the year and save you trips to the grocery store. Each bag also costs just 11 cents, making it a more affordable option than brand-name bags. The Flex-Tech technology helps prevent breaking and tearing, so you can handle heavy loads easily.

Each bag also has a gripping drawstring to prevent it from falling inside your trash can.

Price: $20.99 (on sale from $24.99)

Kirkland Signature CoQ10 helps boost heart health and may help lower blood pressure and safeguard against high blood pressure, all at around 21 cents per pill. With the $4 manufacturer's savings, this supplement is an affordable way to focus on your cardiovascular health.

The special formula is lactose and gluten-free.

Price: $7.69

Fill your spice rack for less with the Kirkland Signature whole black peppercorn. The peppercorns are the perfect size for a home peppermill, and it has a bold flavor that works well in a wide range of recipes, including soup, stew, and chili.

The same product can be purchased from Walmart at nearly double the price.

Price: $12.99

If you like beef jerky, you should try Kirkland Signature Steak Strips. Each piece is made from a whole-top round with a smoky flavor. This jerky costs around $1 an ounce, which is much cheaper than other brands that cost around $1.50 an ounce, making it an affordable high-protein snack.

The Kirkland Signature brand delivers high-quality products at affordable prices that Costco members have come to love. This list of 14 Kirkland Signature products is just a small snapshot of store brands you'll find that will save you money.

In addition to already low private brand prices, keep an eye out for items ending in .97, which indicate a manager's special you won't find in other locations.