Gazelle is buying 32GB iPhone 4s for just over $200, said Scarsella, but those in what it calls "flawless" condition bring in $284. Sellers can get a quote by using the condition calculator on the , or by downloading a from the App Store.

Gregg Keizer covers Microsoft, security issues, Apple, Web browsers and general technology breaking news for Computerworld. Follow Gregg on Twitter at , on or subscribe to . His e-mail address is .

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