what store sells diamond tipped drill bit

Lowe's has them but they are like $30 each. I just bought 2 on ebay (1.5") for $13 delivered. If you're not in a hurry purchase on line.
 
I've purchased the ones online before and they work well. But after two uses, they dull.

I've seen some at HD before that are made for glass and tile and have the same gritty edge but are not "diamond." Do these work well for glass and do they last longer?

You might try the DIY forum?
 
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