You maybe aware of a Deadwood Slot Card Players Club. I normally don't collect slot cards but on a recent trip to Deadwood I discovered several casinos carried a "common" slot card. Useful at 20 casinos in town. Build points on your account at any member casino and exchange for cash. I have attached copy of a flyer that describes the program.
Some of you may be aware of the program, but thought I would pass on the information.
Robert Todd