I find that parts are often actually not available from the OEM suppliers like Western Hills: they all tend to list all parts and show prices... but NLA is still NLA when you try to actually order something NLA.
DSS has put quite a few NLA parts back into production, they have been restoring CB400Fs in bulk. Look there next: their repro parts are very close to factory original.
Finally, the last resort is CMSNL.com in Holland. They've been buying up NOS parts all over the world for years, and have the best stock of obsolete and NLA OEM parts. They also have the highest prices.