Amazon and Walmart are battling to dominate the grocery market, fueling a price war that could rearrange where America shops for food.

To get a firsthand glimpse of this competition, we have periodically been testing Amazon’s effect on grocery prices since the online retailer bought Whole Foods last summer.

Heading into Super Bowl weekend, we thought we would compare the price of ingredients for Steak ’n’ Bacon Cheddar meatballs.

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