MSC have worked well for me. Good choice of makes - Bondhus, Eklind, Wera, usually a Taiwan option fairly cheap.
I actually did the same thing as the OP a few years back. Bought boxes of 100 in 1/16, 3/32 and 1/8 sizes. Definitely the way to go.
Back then MSC stocked a brand called “Brighton Best”. I bought a lot of their stuff, mainly screws. Very reasonably priced, but the hex keys were excellent quality and made in the U.S. I suspected Eklind were the OEM.