We spent a couple of decades in the vac industry and this company, The Henry Company of Hammond IN was our most reliable wholesale vendor. They were / are both wholesale and retail. We could sometimes beat them shopping price but not on service and standing behind stuff. If we called an order in by 11:00 AM it was in our store by 11:00 AM the next day... It's been a few years now but I hear that they are still the same. Covid19 may have slowed things down a bit, I don't know about this year.
Most of the "working parts" of your shop vac are off the shelf parts. Most turbine/motor units were made by either the Lamb Electric Co. or Singer. Switches etc. are common stuff as are cords, hoses, filters, attachments etc. Here is a link:https://www.vacpartsplusstore.com/catalog/
I have no connection to the company, they just served us well for over 20 years.
We used to ask for "Larry" but I suppose he has long retired.
I did not equip with Shopsmiths in spite of the setups but because of them.
1 1988 - Mark V 510 (bought new), 4 Poly vee 1 1/8th HP Mark V's, Mark VII, 1 Mark V Mini, 1 Frankensmith, 1 10-ER, 1 Mark V Push-me-Pull-me Drillpress, SS bandsaw, belt sander, jointer, jigsaw, shaper attach, mortising attach, TS-3650 Rigid tablesaw, RAS, 6" long bed jointer, Foley/Belsaw Planer/molder/ripsaw, 1" sander, oscillating spindle/belt sander, Scroll saw, Woodmizer sawmill