The exact locations aren't known, but Whole Foods staff have reportedly explored stores in places the chain doesn't operate, such as places in Idaho, southern Utah and Wyoming.

Amazon and Whole Foods have declined to comment.

It's not a completely outlandish move for Amazon. Whole Foods is already using Prime as a lure for customers, and it's no great stretch to use the store as a fulfillment center on the side. Still, there's a difference between using existing stores for deliveries and building them for the sake of deliveries. In that light, Whole Foods is quickly becoming a Trojan horse for Amazon that just happens to offer conventional grocery shopping.