Don't get ripped off on this pantry staple.

Perri Ormont Blumberg
March 26, 2018
Geri Lavrov#86614—Moment Editorial/Getty Images

You may think Costco is the price leader for, well, everything, but the wholesale club actually may be overcharging you on one popular kitchen item: Peanut butter.

Yes, that's right, the beloved nutty spread isn't exactly a steal at your local Costco outpost. Instead, a jar of the stuff comes out to more per serving than several of Costco's main competitors. Blogger Root of Good recently compared the prices of 16 ounces of peanut butter at Trader Joe's, Target, Aldi, a Walmart Supercenter, and Costco, to find that Costco was the second most expensive. Grocery store Aldi had the most affordable peanut butter, coming in at $1.08 per 16-ounce serving with Walmart trailing closely behind at $1.16. Next, came mega-chain Target at $1.20. Meanwhile, Costco came in at $1.67, and Trader Joe's at $1.99. Yikes!

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So if you love dipping your spoon in the PB jar, it's probably time to head to other grocers.

For more Costco items that aren't worth your dollar, read Business Insider's guide here.