I to use http://www.customsawing and love them. Thier shipping is fast and cheaper then Grassy Creek though Grassy Creek is a little cheaper on actual prices I think Custom Sawing comes out ahead. I have made several Sassafras Slate/Glass now and a walnut Slate/Glass, actually finished it last night. It' s louder then the Sassafras with a little higher pitch. Word of warning, don' t make just a slate with their pots, there too deep, you will need some sort of sound board such as slate,glass,metal,poxy, etc... The differn' t surfaces do make a differnce in sound. I like to use the double strength glass, it' s a tad louder and helps with the rasp when using certain strikers.