Where can i buy diamond drill bits for my dremel tool?

I want to cut holes in glass, but have been to both Lowe's and Home Depot and they insist that there are no such things as diamond bits for rotary tools like a dremel...even though my friend has a diamond drill bit for HIS rotary tool (he doesn't remember where he got it unfortunately). Where can i find... show more I want to cut holes in glass, but have been to both Lowe's and Home Depot and they insist that there are no such things as diamond bits for rotary tools like a dremel...even though my friend has a diamond drill bit for HIS rotary tool (he doesn't remember where he got it unfortunately). Where can i find these!!! I heard that tungsten carbide bits can grind through glass also, where can i get these bits? Any suggestions! (NO CRITICISM PLEASE!)
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