There are many ways to reward those customers who really support you and your business. It's always a good idea to say thank you and let customers know how much you appreciate them. One way is with a customer loyalty card. You can imprint these cards with just about everything, and loyal customers can use them to get discounts on items, or to buy a certain number of items and then get one free.
A loyalty card is a very small price to pay to say thank-you. And, you may pay an even higher price if you never take the time to say it.