I put it in the classifieds here. Not cheap, but a third less than what I paid.
Had my other one CLA-ed. Wow, that's getting to be non-cheap.
I don't know how or why I ended up with two of these, but the performance is remarkable enough that it's hard to part with one. But for a new-to-me 55mm APO-Sironar that covers 6x12.
D