eBay is your friend. Do a search on the model number and check the 'sold' box. It should bring up any that have sold and at what price. Make sure they actually sold are weren't just listed and didn't sell.
Might want to reconsider your decision to sell these. Any future desire to build electronics of any sort, at least enclosures are worth saving, power supply as well, etc.
This is not the kind of thing you would scrap for parts. A complete set of rare, classic components.