Do you like skinny wallets that are supposed to be good for your spine? These ones crinkle:

http://www.bigskinny.net

Do you fear the RFID chip ie Mark of the Beast?

Many credit cards seem to be increasingly infected with them. You can buy leather wrapped tinfoil, not for your head but for your wallet.

http://www.idstronghold.com

NOTE: Not a vendor, just an indecisive customer.