I've got a #25 an 80a and a rotating polarizer that I bought years ago when it never occurred to me that they would ever be difficult to find. Today, I have a 150mm Rodenstock, A 40 & a 90 for my L/M CL and an 80 and 105 for the Mamiya C TLR that all take 40.5. I really need a hood for the 40, a couple of caps. This place[ http://www.cameragear.com/cf.asp ] has Hoya double-coated filters for about twenty bones apiece.
I think I'll head down to the Second Sunday Camera Sale this week although I hate to pay the admission when I'm just poking around for odds and ends and I sure don't need any equipment temptations right now.