Fresh produce

When you're running errands, condensing them into as few stops as possible is ideal. But when it comes to your fruits and veggies, you're likely paying more at Walmart, despite the convenience of grabbing them at the same time you're shopping for other odds and ends.

"Although Walmart is widely known for its low prices, it frequently focuses on national brand convenience over local sourcing," says Clay Cary, a senior trends analyst at CouponFollow, a website that tracks and shares coupon codes and deals. "This makes produce more pricey."

Ultimately, you're better off shopping for produce at your local grocer or, even better, the farmer's market, where you'll pay less and have the added benefit of fresher inventory grown closer to home.

Furniture

This is a category that actually has little to do with price and everything to do with quality. Across the board, the experts we spoke to warn against purchasing furniture that is specifically made for Walmart. While they have some seemingly great deals, Walmart's furniture offerings could cost you more in the long run, as these products aren't often built to last.

"Walmart tries to price its products low, resulting in the quality and production of its items being reflective of this," Chatman says. "While you might be getting a 'steal' price-wise, you are also losing out on having a quality product," instead getting stuck with something that "isn't likely to be durable and long-lasting."

Chatman suggests looking to IKEA for low-priced, better-value options on home furnishings.

Frozen pizza

This one is strangely specific, but for folks who like Hawaiian pizza, the Great Value Rising Crust Hawaiian frozen pizza is apparently not a "great value" at Walmart, despite being priced at less than $5 per pizza. Clark-Simpson says that her reviewers think the pizza has a "weird taste to it" and a noticeable lack of actual pineapple. And let's face it, the pineapple is what makes a Hawaiian pizza ... Hawaiian.

You're better off buying the well-reviewed DiGiorno Hawaiian-Stye Rising Crust pizza, which does tend to run at least $1 more at local grocers. But, it often goes on sale, putting it in line with Great Value's $4.92 price tag.