I believe these still retail for over $400 USD when purchased without a 2 year contract. Here are completed listings of the same phone on eBay. they average between $300 and $400
Dude..Go on your local Craigslist. I just checked mine and 2 other states. 200 is the average but you can get it for as low as 150 pretty often.
Now, on the other hand, the iphone 5 goes for around 400 on local CL again...sure you didn't get your shit mixed up?
Yes, I'm quite sure I didn't get my *stuff* mixed up
First two I found were listed at $375 and $299. Then I stopped looking. Did you look at the eBay link above? All those listings are for the 16 GB 4S as well.
http://sfbay.craigslist.org/sby/mob/3652530527.html
http://sfbay.craigslist.org/sby/mob/3652502917.html
EDIT:
Unlocked and without a 2-year contract the 16 GB 4S retails for $549.00.
Source: apple.com (you have to click the link that says "Or get iPhone unlocked and contract-free" to see the actual price)
http://store.apple.com/us/buy/home/shop_iphone/family/iphone4s?product=IPHONE4S
Please note, I am taking offers if you'd like to make one.