Actually Smetten.... I operate my own hacking/ modding site devoted to iPhones and the 3G, and I bought all 6 of my iPhones for around $200 each....
You have to look around, try looking on eBay, but search for " i Phone, or iFone, or iPPhone", check for misspellings, and check *ending soonest*.....that's the easiest way to find them..
Also search craigslist for misspellings around your area... I personally bought 4 of mine from seperate people....so the deals are out there...you just have to look
If this helped, i'd appreciate a *thanks*....lol