Neither the iPhone 5c nor the iPhone 5s is available for preorder yet, but you can check out the order pages prior to the preorders going live.
Among the options are unlocked and contract-free phones geared toward T-Mobile users but 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.