I treated myself to a pair of plastic King Kraft brand sawhorses on sale recently at Sears. They were half price or $12.49 plus MI sales tax. And....they were made in the USA :-)
My portable design wall is actually a cork bulletin board which is 24" by 36" I can now support the bulletin board horizontally with the saw horses.
Instant tabletop space to the immediate left of my sewing machine is very helpful. My sewing area is small and the fact that I can store the two sawhorses folded up is a bonus!
Folded dimensions are listed as 22.4 x 1.8" x 32.3
I am sure this idea is not original. I just decided this set up was practical for location of my homemade Big Board or the bulletin board design wall.