Neither the iPhone 5c nor the iPhone 5s is available for pre-order yet, but you can check out the order pages prior to the pre-orders going live. Among the options are unlocked and contract-free phones geared toward T-Mobile users, but they can be used with any GSM-supported carrier. For the iPhone 5s, a 16 GB unlocked phone is $649, 32 GB is $749 and 64 GB is $840. For the iPhone 5c, a 16 GB unlocked phone is $549 and 32 GB phone is $649.
The unlocked iPhones will not work on Sprint or Verizon Wireless.