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You could try Swappa (http://swappa.com/) I haven't used them personally, but a friend did and had positive feedback.

Another vote for Swappa. I bought a phone using the service. As pdubs said, it still goes through PayPal but the site employees keep an eye on the transactions and there are reviews and negative feedback.

Swappa's great, but it still goes through Paypal. Probably a better crowd on there than EBay though and they allow negative feedback.

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