I charge a beer, which theoretically is cheaper than the glass shops or the LFS (depends on the beer maybe
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But there is a catch .... I only have two glass drill bit sizes. One is 5/8", ideal for a float valve, and the other is 1-3/4" which is ideal for a 1" bulkhead. If you need a larger bulkhead than 1" then I can't help you. 1" is good for most applications, though.
To go larger, you could (theoretically) use a Dremel, but based on Ross's recent experiences I'm not too sure how fun that would be.
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Speaking of which .... Ross do you still need that other hole drilled? If so, let me know when you want me over.