Sold my used Iphone 4 32gb on craigslist for $270 3 weeks ago. Not unlocked. *****, only paid $299 for the thing when I got it.
Initially listed it for $175 and got 46 responses! Sent a mass email to all of them and asked them to put in their best offer. Got a bunch of $200's back, a few $220's, a $250, and then a $270.
Looked pristine and still had the box, accessories, manual/stickers, and even the plastic "wraps" to hold usb, earphones, etc. in.