Well, here is one on eBay for just 99p:
http://www.ebay.co.uk/itm/P4PM-30mm-...-/301018069642
I bought it for "future projects"...
No, Frenzie, I didn't even know that there is such a thing as "hole saw" until yesterday. I never needed to do DIY in my life (was always "a pure theorist", from school to University and then in real life also