Where can i buy a iphone 4 logic board?

I need a new iphone 4 logic board, i can't afford to get a new iphone, so I was wondering if anybody knows where to get a new motherboard. I looked on ebay, but i'm not so trusting with the sellers on there. If anybody knows of a legit site that won't break the bank, I would really appreciate it.

Amazon.com Bestbuy.com i will try amazon is a trusted website

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