Amazon.com: 12 Pack Ceramic Tiles for Crafts Coasters, Ceramic White Tiles Unglazed 4x4 with Cork Backing Pads, Use with Alcohol Ink or Acrylic Pouring, DIY Make Your Own Coasters, Mosaics, Painting Projects :
Pixiss Ceramic Tiles for Crafts Coasters,12 Ceramic White Tiles Unglazed 4-Inch Cork Backing Pads - Walmart.com
50 Pack Ceramic Tiles for Crafts Coasters, Hexagon White Tiles Unglazed... | eBay