Locking butt plug harness

Hi, basically I am looking for a locking butt plug harness for me to wear out and about. Ive noticed that none of the harnesses at love honey are locking, and the ones ive found by googling are either in america of cost around £100.

Has anyone else managed to find a cheapish locking harness, and if so is it comfortable enough to wear for long periods of time

Any help is much appreciated