Amazon has the Johnson 200pd 36" pocket door hardware kit for $49.97. This does not include framing. The track can be cut for smaller doors.
This is Johnson's top of the line hardware kit with 72" I beam track and ball bearing wheels. It sells at homedepot for $107.
*Good for use with a door up to 36 in. wide, weighing up to 400 lb., and 1-1/8 in. or thicker
*2020 door hanger features rocker design for constant 4-wheel track contact and equal weight distribution
*Ball bearing wheels for low-resistance rolling
*Flip-of-a-clip separates wheels from door plate for easy door installation
*Adjustable nylon, jamb-mount door guide holds doors firmly in place
*Tracks can be cut down for smaller applications
*Strong aluminum I-beam track is precision extruded for smooth operation and heavy-duty use
*Brass-tone steel components
*Meets ANSI standards