I made a site that compares trade-in values for your mobile device.

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http://mongr.co/
I've been working on this for a while and thought I'd share it here. Any criticism is greatly appreciated.
Basic concept: Generates buyback/trade-in offers from amazon, bestbuy, gamestop, gazelle.com, usell.com, icracked, staples, and apple for your old smartphone.

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