Sure, your third-generation iPad is great and all, but after Tuesday's announcement of Apple's iPad mini and iPad 4, perhaps you wish you could trade-up. Or maybe you feel like you don't have a choice if you want it to retain any value. Well, you're in luck if you want to trade it in. Ebay is not the only option anymore -- there are an increasing number of sites that let you sell your "old" device and put that cash toward a new one.
A lot of these sites work the same way: Enter the information about your device, including its condition and original packaging. The site gives you an estimate of how much your gadget is worth, and if you accept, they send you a pre-paid shipping label (…
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