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Gazelle is worthless and preys on the poor and uneducated. You get less than 50% what you would from selling on ebay. http://www.gazelle.com/iphone/iphone-4s/at-t/iphone-4s-64gb-... vs http://www.ebay.com/sch/Cell-Phones-Smartphones-/9355/i.html...
I sold my iPhone 4 on Gazelle. I know I could have got more through Craigslist or eBay, but it wasn't worth my time. With eBay I have to photograph it, write it up, list it, answer ridiculous questions about shipping it to the 3rd world and take payment in the form of casino chips mailed to me in a few months. Then I have to deal with the buyer, ship it, and the whole time I have to be worried about scammers. All the…
I dont use craigslist, so I cant answer to that. I find the eBay process mostly fine, with the exception of not being able to specify who can bid/buy. If they did that it would be a way more reliable experience.