I'm no expert on the current market values for Becker Europa II's. I bought one years ago on ebay in good cosmetic and electrical condition for a couple hundred bucks. Looking on ebay just now, values are significantly higher: asking prices in the $600 - $700 range are not uncommon. You might want to spend a little time searching there - there are many offered and prices are quite varied. Perhaps some bargains exist.
But if yours is in good cosmetic condition, and you can get it working well for $250, that's probably a cheaper solution than replacing it.