Masters of The Universe Phonograph

I have a Masters of The Universe phonograph in pristine condition. The phonograph has only been used approximately 5 times with adult help/supervision. Due to age the phonograph no longer works. I want to put it up for auction on Ebay, but I don't know how much to sell it for. Can anyone please give me a price range so that I know how much to list it for? I also have a working VideoSmarts set with the tapes. I know that came out in the 80's. How much should I list that for?