Where to get least costly Iphone?

Someone told me that they bought an Iphone for $100.Is that even possible? Where can you get the least costly Iphone (any generation is fine, preferably 3rd or higher).

For the 3rd generation models perhaps for 100 dollars is true. The best deals you might get is on craigslist because they are local and fast transactions. Also keep an eye on ebay or amazon. Beware of phones that are reported stolen because those can't be activated.

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