I have not seen anyone marketing them, but I have not looked.
Not realy high tech, any back yard welder would be able to put one together.
I welded one up last winter from 15$-20$ of scrap metal, an 8x2 inch chunk of chanel iron 6 feet long and 4 legs. Maybe an hour of fitting and welding.
I think my stand is a bit high though at 24 inches to the bottom of the wood, but is fine for wood 12" and less.
Is there and official height?
The stand is key for learning to cut and to gauge saw and chain tuning. Also can use the stand as a sawhorse for cutting lumber, plywood, metal...
I Should paint it though!