The manager of the tool dept at our local Lowes says that they do not order any of the diamond bits-- too expensive. Try eBay-- I got a cheapo set for about what one bit would have cost from Dremel, judging from how their other bits were priced at Lowes. Only tried one of them-- to make a headstone for Miss Kitty, but it worked fine.
Kaytee "Simplexities" on