They are getting crazy expensive. I advertised for one a couple of years ago, and received a email from someone that had one but wasnt planning on selling. He wanted me to make an offer. I did some research and found that most were selling in the $350 range. I offered him $300 and never heard back from him. I think maybe he was insulted? Anyway I found another one a few months later for $100. A much better price. And thats what they sold for new in the '70s when I bought my first one.