Price of a used iphone 4 and 4s?

My friend has a iphone 4 and iphone 4s that were both used for only a year at most. He had a contract with at&t but i have a contract with tmobile. What is the true price I should be paying for both phones since they are used and he bought it through at&t with a contract( meaning he probably did not buy it for the full price)? Thanks everyone!

Added (1). Both phones are 64GB

Added (2). I'm buying the 4s off of him. So how much should he be selling it for?

Look up on Apple.
Search ln google for Apple.
Go on Apple
Look at iphones
Look at 4 & 4s
Hope that helped

I would say 450-580 sounds good unless their in really bad condition

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