Lee Valley started making these a while back:
and has added a few items such as:
(which for some reason isn’t listed on the above page)
Since most of my work is small in scale, and I’ve always had a fascination with miniatures and models, I’ve started buying these and will have to see if there is a synergy w/ my CNC work.
Currently working up a portable workbench design to make use of the afore-mentioned miniature workbench vise.