Too many to count. I have lots. Most were bought on clearance and are now triple in price to buy today. I love the Martelli mat and the colors of the June Taylor. I have mostly Olfa brand in the big mats. The Polar mats are nice if you can find them now. I have three rotating mats, one which is 18 x 24, I use that the most. Use to Hancock Fabrics had 50% off sales on everything quilting, scissors, mats, rulers, anything. I would by by the cart full at those sales. I'm so glad I did.