Bah, that’s what I get for posting before doing my homework. Turns out the things are only $6 each on Fleabay (with $2 sockets) and any that was ever sold will work just fine in a Classic II, what with its feeble 16MHz bus (no 68882s slower than that were ever sold). The only thing to watch is that if I ever do up a proper design and turn these things into a saleable product I need to stay away from the FN-marked PLCC version. It isn’t lead-free-standards compliant.

I will keep you all posted on my progress. Do not expect great rapidity.