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Many people join warehouse clubs like Costco to shop members-only deals and reap big savings. Buying groceries, toiletries, household goods, electronics, and more for less means shoppers can keep more money in their checking accounts.

Some products sold at Costco are unavailable at other retailers. For example, Costco has a private-label brand, Kirkland Signature, which is exclusively sold at its clubs. There are many Kirkland Signature products that receive high praise from Costco loyalists.

Here are a few fantastic Costco items you won’t find elsewhere.

1. Kirkland Signature Flex Tech 13-gallon Kitchen Trash Bags

Costco members can’t seem to stop raving about Costco’s private-label trash bags. Kirkland Signature Flex Tech 13-gallon Kitchen Trash Bags have high reviews. The warehouse club sells a scented and unscented version of these bags. You’ll pay $19.99 for a box of 200 trash bags, which comes to a price of about $0.10 per bag.

This is a worthy Costco find if you want to avoid paying high prices for the name-brand equivalent or store-brand alternatives from other popular stores. If you were to buy a 120-count box of up&up FlexGuard Tall Kitchen Drawstring Trash Bags from Target, you’d pay $16.79, which means you’d spend $0.14 per bag for this household essential.

Pro tip: Remember to use a rewards credit card the next time you stock up on household goods. You can earn cash back rewards when you swipe your card at checkout. Click here to review our list of the best credit cards for Costco to learn how easy it is to get rewarded on your Costco spending.

2. Kirkland Signature Extra Virgin Italian Olive Oil

Olive oil is a must-have cooking essential, and if you use a lot of it, it’s worth buying in bulk at Costco. Shoppers love Costco’s Kirkland Signature extra virgin olive oil sold at their local clubs.

You can score a 2-liter bottle of Kirkland Signature Extra Virgin Italian Olive Oil from Costco for $25.99. At that price, you’re paying about $0.38 per ounce. This product is verified as an authentic extra virgin olive oil by Bureau Veritas, an agency that tests and certifies products.

If you were to buy a 50.8-ounce bottle of well-rated Good & Gather Extra Virgin Olive Oil from Target, you’d pay $20.99 — about $0.41 per ounce. While it’s labeled as extra virgin olive oil, it’s not verified by Bureau Veritas like Costco’s.

3. Kirkland Signature Aller-Tec Tablets

For those who suffer from allergies, it can be expensive to stock up on medication that offers relief from uncomfortable symptoms. One product that many Costco members swear by is Kirkland Signature Aller-Tec Tablets.

A 365-count pack of tablets at Costco costs $14.49, or $0.04 per pill. Since it’s a Kirkland Signature product, it’s only available at Costco. However, the active ingredients are comparable to name-brand Zyrtec.

Target sells a 90-count container of Zyrtec allergy pills for $42.49, which works out to about $0.47 per pill. If you’re trying to reel in your spending, try Costco’s version of this medication.

Look for ways to maximize your savings

Investing in an annual Costco membership could help you save money on everyday essentials and get access to well-rated products like the ones highlighted above. As you shop, look for opportunities to maximize your savings. Shopping at warehouse clubs is one option, but it’s not the only way.

Many people use cash back credit cards to pay for groceries and household goods. Redeeming your cash back rewards is an excellent way to pay yourself back.

Want to earn cash back rewards? Explore our list of the best cash back credit cards with big rewards to find your ideal card.

Top credit card to use at Costco (and everywhere else!)

We love versatile credit cards that offer huge rewards everywhere, including Costco! This card is a standout among America’s favorite credit cards because it offers perhaps the easiest $200 cash bonus you could ever earn and an unlimited 2% cash rewards on purchases, even when you shop at Costco.

Add on the competitive 0% interest period and it’s no wonder we awarded this card Best No Annual Fee Credit Card.

Click here to read our full review for free and apply before the $200 welcome bonus offer ends!

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The Ascent does not cover all offers on the market. Editorial content from The Ascent is separate from The Motley Fool editorial content and is created by a different analyst team.Natasha Gabrielle has no position in any of the stocks mentioned. The Motley Fool has positions in and recommends Costco Wholesale and Target. The Motley Fool has a disclosure policy.