We have a lot of trouble sourcing this sort of material as well.
There was just a post on march 3 adressing a similar issue.
"Mail order source of small lots of metals?"
If you find someone you like would you let us know, please?
I don't know where to find HSS stock (M-whatever, or T-...) but for O-1,
A-2, and W-x, Enco and KBC-tools are handy.
For very small pieces, lots of companies selling lathes also sell square
tool stock of (already hardened) HSS, usually M-1.
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