Jeff Zelevansky / Stringer/ GettuAmazon's deal to acquire Whole Foods merger may seem like a dream come true to some, but there's a realistic chance Walmart could still swoop in to trump Amazon's $13.7 billion offer, according to JPMorgan. Whole Foods stock has been trading above Amazon's offer of $42 a share, signaling that investors believe a bidding war could emerge and drive up the final price for Whole Foods. Competitors like Target, Costco, and Kroger have been rumored as potential suitors, and they'd do anything to make this deal harder for Amazon, according to Barclays analyst Karen Short. According to JPMorgan, Walmart is the only retailer with a legitimate shot of entering the fray. Here's JPMorgan (emphasis added): "From our perspective, we have a hard time seeing Kroger, Costco, or Target coming in over the top.