One local shop gives FABRIC ONLY "punch" cards - it's a business-sized card titled "[Local Quilt Shop name, address and phone] Frequent Buyer Club" and states "Rewarding our Customers with $20 off your next FABRIC purchase when this card is complete." The top and bottom borders each have ten "$10" printed all around the border, signifying $200 total fabric purchases is required to complete the card.
The cutting table staff manage these: you present your fabric to be cut, along with any precuts, the attendant itemizes on a form all fabric purchases, and then totals the pretax purchase. For every full $10 increment of the total purchase, one of the "$10" is crossed off and initialed by the attendant.
When the card is completely crossed out, the back of the card is signed by the attendant recording this. The completed and signed card is taken to the cash register, where the $20 discount is applied at the register, and then the tax is calculated on the discounted purchase.