How to go about buying an iphone 4s?

I have straight talk and you can put one of their sim cards in any phone it fits. I wanted am iphone 4s but its so expensive in stores and buying online doesn't garuntee youll get you moneys worth. What website should i go to or store should i go to to get a cheap one?

What you imagine does not exist.

You need a att unlocked iphone to use on straight talk
$549

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