Thank you for the link! I found this one on Amazon:

來源: 於 2013-04-26 07:40:15 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

http://www.amazon.com/ORI-Cobblestone-Mat/dp/B001ISR736/ref=lh_ni_t?ie=UTF8&psc=1&smid=A1L9NKXDNACY0J

 The reviews are mixed. It seems a very nice idea but not too sure of the quality of the product.