From the brilliant mind of Ren Fetzer comes this little gem!
A spectator freely selects a card from a shuffled deck.
Next the spectator is given a "post-it" sticker to place on the selected card and then asked to sign it. The signed card is then mixed back into the deck.
The magician removes a drive-up deposit envelope from his checkbook. A note reading your interest is enclosed is removed from the envelope. Looking inside the envelope the spectator finds their signed card. Everything can be examined.
Here is an updated version of card to wallet using an ordinary checkbook.
Supplied with everything needed including special gimmick that will fit right into your checkbook.