Well, in my area, I looked at Wal-Mart, Michaels', and Joann's - and was not able to find any! The size you need is 3"x4" and they are made by a company called Darice. All these stores carry them - they are just simply sold out. If you are not able to find them at any of these stores - I would go to
www.abeadstore.com. They sell them for $2.00 for 100 and you have to pay for shipping ($4.88 for Priority Mail). But that was worth it to me after driving all over town trying to locate them. I think there must be a few people in my area trying to make them at the same time. Best of luck!