AHHHH, areas i'm familiar with. The Nutone in my '77 Excella 500 had a broken switch shaft. I kept a close eye on
www.ebay.com under the Nutone Food Service Center search and bid on several units before winning one. It was a beautiful unit that had the solid stainless cover rather than the stainless and brown combination. They also come in white. Anyway, I paid around $142 for the unit alone. New, unused, start on ebay for around $199 and bids usually end up around $250.
I also purchased a blender for $42 off ebay. It was clear with a white top. I have seen rose colored ones also. I bought a knife sharpener for $24 also. They always have someone selling the main power unit as well as accessories. I'd also like to get a mixer one of these days. By the way, I have seen as much as 8 accessories go for upwards of $500. They are a much sought after item.
The vacuum in my rear bath coach was mounted in the rear outside compartment. I did not have any accessories with this unit. The switch is mounted under the counter next to the 110 volt circuit breaker box behind the tambour sliding door. It looks just like a wall switch. The vacuum unit plugs into a regular wall plug that is mounted in the rear compartment on the right hand side and is activated by the beforementioned switch. Craig