There were literally thousands of FF episodes. If you have some interesting stuff already on tape, you can try to contact a tape trader who deals with game shows. Some of these people get off on Lottery Scratch-Off Ticket Gameshows so if those air in your area you might have something. Google "Game Show Tape Trade" and see what people are offering.
Be prepared to have a general idea (or better yet, an exact date) of when the show aired. They will probably offer little, if any, help trying to track it down in their collection and they are pretty surly if you even ask.
Or, a better option: GSN runs old eps of FF almost daily. Check your listings and start recording it religiously EVERY time it's on (have you thought about buying a Tivo - because now's a good time). You might get lucky and nab the episode you're looking for.