Can i buy the iphone 5 without having a contract or anything?

I'm not eligible for an upgrade until march. I currently have the 3gs, and i'm having so many problems with it, my screen is shattered and what not. Its old. I need a new phone, but long story short. I don't want to buy a new line or contract or anything. I just want to buy the phone and pay full price for it. You know what i mean?
and how much would that cost.

Added (1). So will i just be able to put my current sims card in it? I have at&t

Added (2). So will i just be able to put my current sims card in it? I have at&t

Added (3). So will i just be able to put my current sims card in it? I have at&t

$799 and you will still need a contract to use it.

If you pay for a factory unlocked iPhone 5, you don't need a contract

as for your Additional Details:
no, the new iPhone 5 uses a nano-SIM card, which is smaller than either standard or micro-SIM cards.