I was just in the market for a shooting bench, at least a fair bit portable. I scoured the net and the usual sources. I was looking closely at a small folding, plastic table from ‘Lifetime’, seem to be well made & get good reviews. A few models have adjustable heights.
I also looked for something I can use when not shooting, in the garage, or maybe as a cleaning platform near the gunsafe.
After looking at the folding table, I had to pass, a bit to wobbly. I ended up getting a Husky portable job site 1.8 x 3’ workbench, right at $80 from Home Depot. So far it checks out fine, portable, easy to carry & setup.
https://www.homedepot.com/p/Husky-1-8-ft-x-3-ft-Portable-Jobsite-Workbench-225047/205887786
Do I think this Husky bench is better than the heavy duty, dedicated, shooting bench? Of course not. Just saying, if one wants something that has other uses, it may be worth consideration. If one keeps an eye out, should be able to catch it for $20 cheaper.
OBTW, I did see a guy on U-tube with plans on a simple bench. I have a pivoting gun rest, so it gives a little swing even on a fixed table.