Cost of iPhone 5s or iPhone 5?

I want to purchase an iPhone 5 so I can connect it to MetroPCS now that they can connect iPhone 5 to their service. I want to know the price at an apple store and can I buy it without a carrier, or atleast AT&T without a contract or any service that requires payment.

Without an AT&T contract (but that would still be locked to AT&T btw) it would be $549
without any carrier (unlocked) it would be $649 (though that configuration is not available yet (likely November.

Also metroPCS is a CDMA carrier whereas AT&T & these unlocked iPhones are GSM.

Also the iPhone 5 was discontinued so unless you are buying from another vendor your choices would be the 5c or 5s.