Current value of iPhone 4/4s?

I have a black 16gb iPhone 4 used that is still in functioning condition, no cracks, minimal scratches, and a two small scuffs. The back had a screen protector on since the beginning and is new when peeled. Original box with accessories and manuals included.

I also have a white 16gb iPhone 4s that has never been used, all the accessories are sealed (except headphones), with the original box still in shrink wrap.
Both phones are for at&t.
Would love to get an estimate, thanks!

Iphone 4 are selling for $100-$150
4s are selling for $200-$225
i have a iphone 5 id trade for both if your in PA, email me