I have an iPhone 4S and would like to buy it out?

I have an iPhone 4S and it's on a 3 year contract. It's going to be a year on August 21st. And I would like to buy it out to get an iPhone 5, does anyone have any idea how much around that would cost?

1.It depends on who your phone carrier is.
2. I assume your upgrades are every 3 years or 36 months

The four major carriers offer 16GB iPhone 5 for $199.99 with a 2-year contract/upgrade
A local Apple store will match the carrier's price if you have a new contract or a pending upgrade
Full retail price varies on who is your phone carrier

You can buy an iPhone 5 off ebay for between $400-$700 I just seen black one go for $400.00 with shipping about 10 minutes ago.

You can try craigslist for your state and see what deal you can strike