I am pretty sure the Fambaa was an excusive to Fao Schwartz, that's why I don't have one, but I can't remember. So, yeah that would be considered rare in my book.
Oppo Rancis isn't rare. He was only released in the Jedi Council pack. But when those came out, they weren't hard to find at all.
What I consider rare would be exclusives and as I said above, Scorch which I had to look everywhere for. Rare would probably really mean some of those Ewok cartoon figures that were only released in South America or something and are going for thousands of dollars. I think everyone has their own definition of rare.
Personally, I am proud of the fact that I have only bought one thing in my entire collection from E-Bay. And that was Oola and Salacious Crumb which I never sent off for. I hate scalpers who go around buying up all the good stuff and then quadrupling the price online.