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I've never heard anyone even suggest they were the cheapest. I've heard of a lot other adjectives, though.

Agreed, also how would you mix in the cost of failure with each of those providers? (just out of curiosity)

Amazom is fairly cheap and is popular so you have lots of support dev-wise from communities.

What about features? Do other providers support something like AMIs, etc?

But people are asking this type of questions. Look here for instance: