IPHONE 3GS - not used - 16GB !! - white ?

We bought this iphone from the States, and have not been able to use it as it is locked to the AT&T service provider. We are offering it at less than half price to someone who knows how to unlock it or knows someone who can unlock it. BARGAIN. The phone is in excellent condition (Price for a new model from the apple store is more than 300)