You probably already found this, but maybe it will help. Or try searching on Craftster/online. Dremel has a website too www.dremel.com so you can look at their drill bits; they have sizes listed and some of them are pretty skinny and have diamonds, though the ones I saw with diamonds weren't actually drill bits -_-;. I suspect they have them though, since that topic was talking about it. You can buy drill bits off of hardware stores, Amazon.com, ebay, etc.
Another way is I am probably not local to you at all, but there are two bead shops near me, History Bead Co. and The Bead Mine. At Bead Mine the guy actually has a drill that will go through stone, and I think will drill stuff for you if you bring it in. (I don't remember if it was free or not though, cause I had wood that was way too soft to need that powerful drill.) So you can try calling up bead shops from your phonebook and see if they do glass/ceramic.