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business/news//The Arizona Republic
The difference between the cheapest and most expensive stores was over 33%, the report found.
Costco had the lowest grocery prices, at 21.4% cheaper than Walmart.
KEY POINTS
Six grocery chains were found to be cheaper than Walmart, including three in Arizona.
Whole Foods was the most expensive, with prices 39.7% higher than Walmart.
Trader Joe's prices were 24.6% higher than Walmart, making it among the priciest options.