They definitely sell digital downloads, and some of those come in the form of Steam keys. For example, their current weekly deal: http://www.amazon.com/The-Harry-Batman-Pack-Download/dp/B009YL65Q4
[edit]: I am slow.
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Not every game sold by these comes in form of Steam key of course, but recently even Origin started to sell Steam games :-)
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Just a random question - i know you get steam games by buying them, but where/how do people get steam keys? not beta accesses like Dota 2 and such, i know there are giveaways on the web. but how on earth do people get a steam keys for Triple A games?
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