Re: Drill bits
I generally buy cheap HSS bits from the local Screwfix, use them mercilessly and as soon as they become blunt subject them to the Navy Standard Flotation Test[1].
Only time I go for 'special' bits is when drilling Stainless or Cast-Iron. Oh for "Borazon"-tipped bits as used by the guys drilling the Martian spaceship in "Quatermass and the Pit".
[1] Hurl the component-to=be=tested into the nearest large body of water. If it floats, recover it and reuse. If it sinks....
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