There is more chance of the pope coming out of the closet during the next Pride march than finding these things for sale.
Just sold both of mine within the last few months. Actually traded the second set of CSPPC & CVPPC for an 80MHz CS Mk2 plus cash.
I almost never ran any PPC software on them and now I am into running MorphOS2.7 on 1.5GHz & 1.42GHz G4's and will soon have a new X1000 w/PA6T, so running PPC software on the older, slower Phase5 cards is not that appealing anymore. So, running 68k software at 80MHz seemed like it would be more useful than the very rare instances of running any PPC software on an A4000.
The CSPPC's are rare, but they come up for sale a few times each year.