How much should I sell my old iPhone 4 for?

I just got a new iPhone 5, and I have a friend wants to buy my iPhone 4 from me. However, I don't have any idea what to sell it for. The only thing really wrong with it is that the camera on the back of the phone is completely scratched up, and all pictures you take with it are blurry (I put it in my pocket too much without a case to protect it… ). Otherwise, it works well. What would the phone be worth about?

Added (1). I forgot to mention that it is the 16GB iPhone.

In that condition it would go from 100-150 if its less than 32gb and 200-250 if its 32gb+

About $200-$250

$200 or less… They aren't worth anymore

Like 150 -200

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