Can the iPhone 5 from sprint be unlocked?

Can the iPhone 5 from sprint be unlocked? Is there any legit website that do unlocks for the USA sprint iPhone 5?

Yes, that's no problem. The easiest way will be to get it unlocked at one of the big online vendors like http://www.cellfservices.com/ as local phone repair shops will charge significantly more. However, before ordering you should make sure that your ESN is not blacklisted/barred as otherwise your iPhone can't be unlocked.