I shoot steel cinder block molds that can often be had free from brickyards if they make their own cinder blocks (most do) when they get out of tolerance. It's 1/2" stuff that kinda resembles stainless steel the size of cinder blocks obviously, and seems to last forever. Just get 3 pieces of rebar a couple copper or galvanized plumbing T's, pound 2 in the ground put the T's on top, slide the 3rd rebar thru, and hang steel from it with S-hooks. You'll have to burn the holes in the steel as a carbon bit won't touch it.
For big long-range tgts. I use 4-5 ft. pieces of electrcal conduit, big pieces of cardboard, 2 more pieces of rebar, and cable ties (zip straps). Attach the carboard to the conduit with the cable ties all along the edges, pound the rebar into the ground and slide the tgts. over them. Cheap, quick to assemble, light and very portable.