Why 2000 may I ask?
I want to use them for position feedback on a homebrew CNC device (to build keyboards with, of course
), and the native increment is 200 × 10 tpi.
Yeah, finding a 2k dpi mouse at that money is pretty much impossible, although you could look at the Asian market, they've got loads of cheap mice with all sorts of sensors, you might get lucky there.
Yes, there are some approaching $10 (plenty at $20), but none of them advertise PS/2 support, though the controller may in fact support it. I was hoping someone would know of some particular models that do, or have a documented sensor separate from the host interface.
I think I've found some 1000dpi ones to use for now.