It looks like what you really want is a cardholder not a wallet.
These are thinnest wallets I've seen. Good quality too:
http://www.bigskinny.net/
I just switched from those to one of these:
http://www.popovleather.com/
There is a 20% off coupon for the popov site. It's top quality leather at a great price. Bought both a wallet and a cardholder like this:
http://www.popovleather.com/acorn-leather-card-holder/