The problem is, a Made in the U.S.A. spindle would be quite a bit more than 2–3 hundred dollars.
Germany is making them in a variety of models, but the form factor is awkward to say the least (43mm neck/mounting point) or a flat back which requires an adapter plate:
which I have working, but still need to resolve dust collection for shorter tools (which due to the scale of work I do is most of what I use).