So no one else purchases these in hopes of bending, here is a short list of keyboards that I haven't found too much to work with in:

Casio PT-87: Admittedly, I didn't spend too much time with this little monophonic monster, but there didn't seem to be much there.

Casio MT-18: Also monophonic, two days of search found a mediocre set of pitch points and a couple of unimpressive staticy body contacts

Yamaha PSS-130: This FM keyboard looks somewhat promising initially, but delivers nothing.

Casio PT-10: There were a couple of ok bends in this one, but not enough, in my opinion, to justify buying one of these anywhere other than a yardsale or thrift store.


Feel free to add to the list if you know of some others to avoid.