>I'm interested in why you consider it shady for a retailer not to sell a product. I don't see Google or Apple selling products from anyone but themselves (mostly. Apple does sell a few accessories and Google has some pure editions which they have a hand in). Pick any retailer, and there are brands and products they don't sell.

That's because google and apple aren't the Walmart of the internet, they make electronics. Amazon specializes in selling stuff, google and apple make stuff and also happen to sell them on their website, or you could buy it from somewhere else (in google's case)