It depends on how long you want to wait. If you're patient enough, in a few years you could probably find a copy cheap at a yard sale or thrift store. It's not like trying to find an old Turbo Duo or Sega CD game now which would be much more difficult to find cheap(still possible if you try hard enough and get lucky).

Or you could probably trade for it at it's current value. You'd probably be able to find some game worth the same amount for a cheaper price and make a trade.