Bargin
http://www.unlockiphoneus.com/
Seriously though, I don't know how they can get away with selling it like this. Worryingly this was on the top ten news stories on googles RSS feed which gives it more credibility.
Also i didn't realise you can JB the iPhone4 yet.
edit to say i've just noticed you can buy an app pack from them as well! Sweeet
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