http://richontools.com/catalog/i174.html
Those are the ones I use. Don't know how to beat the price. I've drilled quite a few holes with the 45mm one and it's still going strong.
Tim 
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"The moment you doubt whether you can fly, you cease forever to be able to do it..." J.M. Barrie
Current Tank Info: 210 AGA RR, Apex, 3x Kessil A360W & 2x 80W T5s, GEO 618 Ca Rx, BM220 CS2 skimmer, Tunze 6100s, 42" ETSS/AE Tech refugium/sump
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