WANTED - iPhone 4S 16GB! Or maybe a Nexus 4, depending on pricing...

I want to buy an iPhone 4S 16GB (preferably unlocked, but AT&T or any GSM carrier would be fine)
In good condition, I'm willing to pay $260 cash or little more depending on the condition and if it comes with box and all cables.

Maybe, I would fall for a Google LG Nexus 4, depending on the condition and pricing.

I'm here just for the summer and I want to take the phone back to Brazil.
Thank you!