A few years ago I was hunting for an FA* 200/4.0 macro as well. I mailed and called all over the world for a copy and ended up buying one from Pentax in Sweden. As far as I know that was the last *new* one available in the world. At that point I would have paid ANY amount to get a copy of the 200mm.
Luckily I had to spend a tad less at € 1700.00, but still worth every penny to me.
Now the A* 200/4.0 I got at a bargain, but in fact I use that one more. It's more compact and easier to carry along when taking other lenses as well. When I'm on a 100% macro trip I generally use the FA* version with it's associated gear (flash, bellows, TC, tripod, etc).
Would I pay $ 3500,00 now for an FA* version? Probably I would; if you need the tools, you have to spend the money. Why would spending $ 3500 on a macro lens be different than spending $ 3500 on a 300/2.8 prime?
Fact is that market prices don't apply anymore when dealing with ULTRA rare lenses.
Here is a comparison in size of the two:
Mike