I built my own. For the steel plates I used old angle iron and I bought some 2x4 1/4" wall tubing. A 2x4 fits perfect into it. 2x4 lumber can be bought cheap or I get them from construction sites scrap pile. Easy to vary the height that way. They take a lot of abuse before they fall apart. Grade 5 carriage bolt - have yet to replace one.
I also used some 1x2 tubing for the uprights to hold some 1x2 lumber to staple paper/cardboard targets to. I welded several and the various "normal" widths of different targets.
The carriage bolts are bought from here and include a spring and nut. I also bought my plates from here.
https://shootsteel.com/hardware-kit-for-static-target-holder/I have not had any handgun bullets penetrate the steel stands that I made. Rifle rounds will penetrate. (so don't shoot it - yea - I know). The steel plates have held up just as advertised. Very very good!
I did find I needed to add drain hole at the bottom of the part that holds the 2x4. If not, the water stays in and swells the wood making it difficult to remove.
I thought of making something that goes into the dirt pile, but I wanted to be able to have close and far targets to practice transitions. Also, for rifle needed something portable to move around in the field.
Yes, I did a quick wire brush and painted them with Rustoleum before I used them.