For some reason these little guys seem to pop in and out of easy availability, but most of the larger catalogue chains should have at least one tucked away somewhere.
pricewise: probably around $300 or less.
specs: 45 note, velocity sensitive, octave up/down, one-button transposition, split/layering, sequencer start/stop, assignable pot (volume, tempo, etc.)
GM/GS compatible. The first run was done in red, but Roland has a Rev2 that's in black.
*WONDERFUL* controller, though. I've had mine for about a year now and *love* it..