The best place to answer most of your questions is Jim Blasik's wonderful site:
He goes into wonderful detail about the history of the company and each model RF that was produced. Also, his repaints are to die for!
No, FED doesn't produce cameras anymore. The company is still in existance last I heard, but they produce microscope optics, I believe.
Ebay would be the best place to buy, unless you can find someone here who has one to sell. I'd recommed the seller alex-photo. He's very honest and ships very fast. His delivery times from Ukraine to US average 9-14 days.