Make your own coasters - tiles (Home Depot) and scrapbook paper. Adhere to tile with Mod Podge and let dry. Spray a coat of clear spray paint and let dry. Attach felt pads to the bottom ((Christmas gifts!
Turn Tiles into Coasters by Stamping them with Paint! Have some Christmas stamps? Get some inexpensive tiles. Probably after they are thoroughly dried would be smart to give a couple coats of a clear sealer, so ink lasts.