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One of the benefits of joining Costco is saving more money on groceries and household essentials. But the reason Costco tends to offer so much savings isn’t just because it sells these products in bulk. It’s also because Costco makes a specific effort to keep its prices as low as possible.

During the company’s most recent earnings call, Costco CFO Gary Millerchip said, “Our goal is always to be the first to lower prices where we see the opportunities to do so.” And he’s made good on that goal by slashing the cost of a few key items.

These four products will cost you less money at Costco

Millerchip called out a few items whose prices have recently declined:

• Kirkland Signature standard foil was reduced from $31.99 to $29.99
• Kirkland Signature macadamia nuts were reduced from $18.99 to $13.99
• Kirkland Signature olive oil three-liter jugs were reduced from $38.99 to $34.99
• Kirkland Signature baguette two-packs were reduced from $5.99 to $4.99

Now, there are a few things to note about these prices. First, Millerchip is referring to in-store prices, which are commonly lower than the prices you’ll find on Costco.com. Case in point: Kirkland macadamia nuts are priced at $16.99 online.

Second, Costco prices can vary by store location. It’s unclear as to which markets Millerchip is referring to with the prices above. They may be representative of most Costco markets, but don’t be shocked if your local store shows a different price.

How to save even more on Costco groceries and supplies

The fact that the above items have seen a recent price reduction is a good thing in theory. But let’s face it, if you don’t love macadamia nuts and you never buy the baguettes, you’re probably not that excited. And while aluminum foil and olive oil are staple items for a lot of people, those may be just two items of many you buy regularly.

The good news, though, is that if you know how to crack Costco’s price codes, you can save yourself even more money on groceries and household essentials. Prices that end in a seven indicate you’re looking at a clearance item. It pays to stock up on clearance items you use regularly with a long expiration date.

Similarly, items whose prices end with 88 are usually a manager markdown. Costco stores will often discount inventory they’re trying to move off shelves, so that’s another opportunity to reap savings.

Also, using the right credit cards could put more cash back in your pocket, making your Costco shopping even more affordable. Click here for a list of the best credit cards for Costco purchases.

Costco’s goal is to offer the lowest prices it can, so don’t be surprised if you see additional items discounted in the coming weeks. But also, it’s important to read Costco’s price labels carefully so you can enjoy even more savings.

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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.Maurie Backman has no position in any of the stocks mentioned. The Motley Fool has positions in and recommends Costco Wholesale. The Motley Fool has a disclosure policy.