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You haven't been able to buy one there since the 3G came out. I think you can order one online from AT&T, but when the 3G came out, online ordering went bye-bye everywhere for a few months.
 
What rock have you been under for six months? ;) Are you outside the US? Because the 3G has never been on sale on store.apple.com/us. They do sell online to other countries though.
 
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