For the smaller sizes we generally use Suttons,packs of 10 or 20.Mainly 1/8,5/32,3/16,1/4",some double ended.
Larger just buy whatever brand, huge price differences though.
I dont know if the more expensive brand actually stays sharp longer?
What does make them last a lot longer,when drilling steel,or stainless steel is cutting compound.
I bought a 400mm 1/2" the other day,one brand was half the price of the other.
I grabbed the cheaper one as no doubt it will vanish before it gets worn out....
We generally get them at either either Trade Tools,Tool city,or Bunnings.



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