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I wouldnt trust a used iphone because I figure someone tried to hack it and something went wrong. Maybe its not an obvious problem (phone cuts on and makes calls) but I would be paranoid. Only used iphone I would considered is a factory refurb direct from apple. In fact, I bought two.
 
Apple offers refurbished 8GBs for $350 on the website right now. They come with a warranty.

You can also get a new 4GB for $300 while supplies last. If you're looking for used and don't care about the warranty, check ebay. I'm betting there are some cheaper ones there....but as always, you get what you pay for.
 
Apple offers refurbished 8GBs for $350 on the website right now. They come with a warranty.

You can also get a new 4GB for $300 while supplies last. If you're looking for used and don't care about the warranty, check ebay. I'm betting there are some cheaper ones there....but as always, you get what you pay for.

I didn't even think about refurbed..
 
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