
This is going to be a huge hit: an iPhone 4 and iPhone 4S back replacement. Not a case, but a real mirror that replaces your current iPhone's back cover. And they are only $30!
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They don't seem as awesome as the wooden Jackbacks to me, but many people will love this one a lot more. [iFixit]
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or you could get these 6 for $2.59 (not my auction)
[www.ebay.com]
They work great , and as an added benefit , make it hard to see from odd angles. Making shoulder surfing very hard.