Search Ebay. There are many hacked and even unlocked phones available for sale there. Just make sure the person you are buying from has established themselves as a good seller. Check for their feedback and make sure they don't have complaints against them for not shipping or other problems. Good luck on getting an iPhone.
i though this was another one of those threads where they list a million different things they're selling at some gay website. and to think, i had already though of something mean to say :<
i guess i'll just say it to the next customer to come into the store.
ANYWAY i think the title was a bit misleading.
but to answer your quesssstion, i would also suggest eBay. if you are not a frequent eBay user though, i would suggest looking up some of the buyers guides they have on their website before buying. they are a great help and can give you tips on who/where to buy from, avoiding tips and expensive charges.
i've been using eBay for quite some time now and really haven't had any problems with it, but then again, i do my homework.