Our guild built a bunch of stands using plywood for the base, 3" PVC for the uprights, and wooden 2x2's (or maybe smaller) for the cross pieces. The stands aren't that hard to make, but storing them between quilt shows is a problem. A nearby guild made similar stands, and we get to use theirs (and they use ours) so that doubles the number for each of us. I've seen others made more simply using PVC with buckets of rocks holding the PVC upright. (The rocks were in plastic bags, making removal easier.) I'm attaching a few pictures to give you an idea.