Originally Posted by Kiecker
Brett charged me $2.50 per tooth. I have three such cogs 18, 20, 22. Note, you can always get a Shimano DX cog for $5 and drill it out. You'll also have to grind the inner slines down too to fit your hub.
no tools...no garage...no friends with tools or garages...that pretty much rules out cheaply drilling out a regular cog.