Simple: make me an offer I can’t refuse. Comment here, or use my contact form if you prefer.
Specs:16GB, black, fall 2010, with soft case, original headphones, standard cable, power adapter, as well as the small pin to open the SIM slot. Phone is factory unlocked, and works with any GSM carrier, worldwide (I’ve used it with Canadian, U.S. and Mexican carriers), or any plan you want (pay-as-you-go, etc).
Pricing: Apple does not sell the 16GB any more, but the 8GB one can be bought for $450. Base your offer on those facts. :)