TL;DR - I sell cleaned vintage keyboards regularly and at reasonable prices.
http://www.ebay.com/usr/devrialI've found several sources of vintage keyboards in my area and I can't keep them all... So I figured I'd sell them. I should have at least 5 units per month; it depends on what my supply chain provides.
I clean most boards before sending them to you:
-The case is disassembled and thoroughly cleaned via a trade secret (no, I don't retrobrite things)
-The keycaps are pulled and soaked in denture cleaner to disinfect/clean them
-The plate is gently brushed and vacuumed to remove non-sticky dirt/debris (I don't de-solder the switches, etc.)
-I DO NOT mess with cords, as they are heinously annoying to clean
-I DO NOT lube stabilizers or keys (unless keys are stuck, in which case they get a drop of Faderlube)
My listings are designed to be BS free:
-I list the vital stats (branding, model #, etc.)
-I list whether the item is tested/working/untested/not working
-I photograph the front/back of the board
-I specify the connection type
-I specify and photograph the switch type (to the best of my knowledge)
-I specify and photograph the keycap type (to the best of my knowledge)
-I list flaws (especially if they aren't obvious in the photos)
I hope to see some business from the forum!