I picked up a cheap,square metal bank while in Vegas at the 2005 convention at one of those cheesy 99 cent souvenir shops on the strip.
It has pictures of the Vegas casinos on the side of it and has an incredible "guilt" factor if I take it out of my bedroom dresser drawer and even think about raiding it! All I have to do is look at the pictures on the side, dream of the next convention and I always put it back into the drawer, untouched!
Whenever I have an extra $20 bill left over after grocery shopping, I plug it into the bank. I try to do this at least twice a month and when the convention rolls around, I have at least $500 stashed aside that is solely "chip convention floor money"....Rick is completely right folks, this works!

PS - Congrats on the 14 missing lbs Rick!