Consumer Reports has partnered with an industry market research group to identify the most and least affordable grocery store chains nationwide, as well as the most and least affordable grocery chains regionally in six metropolitan areas. The results reveal major differences in pricing.

If you’ve been to the grocery store anytime recently, the feeling of sticker shock will be familiar. For me, it happened the other day when I was looking to buy ground beef, a staple I rarely buy unless a recipe specifically calls for it. Where I live, the price of a pound and a half of ground beef has seemingly doubled—from roughly $6 or $7 to $12 to $14, since I last bought it.

Of course, there are plenty of strategies out there to help you save money at the grocery store these days—and one of them is to be strategic in which groceries you buy at which stores. New data released earlier this month by Consumer Reports, analyzing the most and least affordable grocery chains nationwide, could help you save some serious coin.

Here’s how the nonprofit did it: In partnership with the Strategic Research Group, an industry market research group, Consumer Reports compared the prices on grocery hauls featuring commonly purchased items at mainstream grocery store chains across six regionally representative U.S. cities: Boston, Chicago, Dallas/Fort Worth, Denver, Los Angeles, and Virginia Beach.

Source: These Are the Most and Least Affordable Grocery Chains