Wanted::: iphone 4 or iphone 4s (Buying)

Description:

I want to buy an Iphone 4 on either the three network or unlocked same goes for the iphone 4s on either the three network or unlocked.

I'm willing to pay upto 80-100 for iphone 4 depending on quality
I'm willing to pay upto 90-110 for iphone 4s depending on quality