You can easily get a first generation iPhone on eBay, locked or unlocked. If you get an unlocked one, it probably will cost more than locked, but it can always be restored on iTunes to bring it back to factory default conditions. (Because unlocking is so simple on the first gen phone, it is a bit of a mystery that the unlocked sell for more than locked ones - lots of people don't know this I guess.) Locked or unlocked, they are still going for something of a premium over the 3G, though. Plan on paying something like $250-350 for an 8GB phone. If you are patient, you may do a little better.