I use old drums from big trucks to make stands for my stuff. Very heavy and stable, and cheap or free to get. Go to a big truck shop and some will just give them to you, or go to a scrapyard and buy one. Typically 30 cents a lb where I live for steel/cast iron, so a drum costs me less than $30 if I can't get a free one. Drums are nice because without using casters you can move them around easily. I'll post a pic of one I'm building right now when I get out to my shop tomorrow.