How much could a 64G iphone 4S sell for?

How much could a 10/10 condition, brand new, in the box, along with the charger and earbuds iPhone 4S, 64G sell for?

Probably about 450 doallers
http://www.amazon.com/...005YTY38C/

Look to see they are selling for on eBay, not what they are asking, but the actual prices from completed auctions.