If you're looking for the lowest grocery store prices, here are eight national and regional chains where you'll find them.

According to our Consumer Reports supermarket report, these retailers, ranging from vast warehouse clubs to an upstart from Europe, had the most competitive prices. The report is based on a survey of more than 50,000 Consumer Reports subscribers completed earlier this year by the Consumer Reports National Research Center.

Here's the lineup, in alphabetical order:

Eight Standouts for Grocery Store Prices

• Aldi. This fast-growing, no-frills import from Germany operates stores about one-third the size of a typical American grocer, in the eastern half of the U.S. and southern California. It sells a limited selection, mainly private-label goods. It's interesting to note that the holding company that owns Aldi has a sister company that owns Trader Joe's. 

• Costco. Who could pass up a 3-pound rotisserie chicken for $4.99 at this venerable warehouse club, cheaper in some cases than a raw bird of the same size? Our survey respondents also gave the national retailer top marks for fresh store-prepared foods.

• Fareway Stores. This family-owned chain operates in Iowa, Illinois, Minnesota, Nebraska, and recently, South Dakota. To celebrate the grocery store's 79th anniversary earlier this year, it marked down prices so that they all ended with .79. Deals included a pound of strawberries for 79 cents.

• Market Basket (Northeast). Residents of Maine, Massachusetts, and New Hampshire know this family-owned chain for its low prices and absence of self-checkout lanes. Our subscribers placed Market Basket among the top-rated chains overall, along with the East Coast retailer Wegmans, Trader Joe's, and Publix, a Southern regional chain.

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• Military Commissary. The federal government ensures that these vast stores, open only to those carrying authorized Department of Defense ID cards, offer competitive prices for the astounding 38,000 items they sell. 

• Trader Joe's. The national chain, known for its funky vibe and unique store-brand products, pleased our readers with its competitive prices and excelled in store cleanliness, staff courtesy, store-brand quality, and selection of healthy options. Trader Joe's is among the top-rated chains overall, according to our survey.

• WinCo. With more than 100 stores in the West, WinCo sells many items in bulk and further trims costs by requiring customers to bag their own items. Several readers on CR's Facebook page said they did most of their shopping at these warehouse-style grocery stores. “The appearance of the WinCo store's interior will go unchanged for decade after decade, which is nice,” said one. “I don't want never-ending remodeling driving up the price.”

• Woodman's. Warehouse-style Woodman’s, which operates in Illinois and Wisconsin, passes on savings by selling items in bulk. Another way the employee-owned retailer saves is by refusing to accept credit cards, thereby sidestepping the associated processing fees. 

In addition to grocery store prices, other factors contributed to readers' satisfaction with grocery stores. Wegmans, which topped our ratings, offers competitive prices as well as other commendable features including fresh store-prepared foods, courteous staff, fast checkout, and high-quality produce. Wegmans has placed near or at the top of our ratings many times since 2005.