I guess Amazon is even more committed to their retail roots and their core business than people might have guessed. According to sources quoted from Techradar, Amazon is negotiating with Google to carry the Nexus 7. Here's a quote,

An Amazon spokesperson told TechRadar: "People higher up in Amazon are talking to Google regarding the Nexus 7."
Is this a case of hedging your bets? It would be truly surprising if Amazon actually stocked their biggest rivals product. Still, if they do it will be good for Android, and they are first and foremost a retailer. It will be interesting to see if this turns out to be true. We will keep an eye on this and get back with you if something is confirmed.

Source: NexusTablets.net via Techradar