I’ve been buying twist bits from
DrillHog in Kalispell, MT. Lifetime warranty on them, and they’ve been fine with replacements when I do screw up a bit.
For other types of bits, I have a mix. All my
spoon bits are the Gramercy Tools ones. TFWW sells the Fisch
Jennings-pattern auger bits, and I have those, but they don’t sell 11, 13, or 15/16, so I have vintage ones in those sizes.
Fisch Wave bits for forstners, which work well. I’ve got a full set (to 20/16) of vintage Irwin augers, too. Probably a bunch I’m forgetting off the top of my head, too.