The Cygnett FlipWallet attempts to combine the functionality of a wallet and the scratch protection of a case. It is well made, gives you access to all your ports and buttons, and does work as a wallet, but all the extra material makes the basic use of your iPhone a challenge.
Available for $39.99 here: http://us.cygnett.com/iphone/iphone-5th-gen/flipwallet.html
Other Cygnett cases
UrbanShield for iPhone 5: http://goo.gl/Y1WVP
WorkMate for iPhone 5: http://goo.gl/lpFY7