Seen diamond hole saw sets at Princess Auto for around $50. Largest size might not be big enough but gives an idea that there not a whole lot of money. I've even drilled a 20 and 33g just using a Demel diamond bit.
You definitely want to drill, but might consider drilling 2 holes for your drain so you can run a Herbie (or 3 holes for a Beananimal drain). You'll find Durso can be quiet, but a Herbie is silent plus the advantage of no bubbling/gurgling in the sump.
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