One REALLY cheap way to mount targets is to get three pieces of half inch rebar about 5 feet long, two half inch plumbing elbows, and four half inch pipe nipples about 4-6 inches long. Screw the pipe nipples into the 90 degree elbows..pound one piece of rebar into the ground, use your cross bar piece of rebar to show you where to pound in the second piece of rebar, then use the 90 degree elbows to mount your cross bar and target. So far, the two best items for hanging targets I have found are either fire hose, or conveyor belt. Chain, or cable shear off with a solid bullet strike. Conveyer belt and fire hose take lots of hits and still hold up the targets.
We have used this system for our rifle matches, and the plates and hanging material have lasted through many hundreds of shooters hitting both the targets, mounting system, and hanging system. Cheap, and it works....what is not to like?