I have see many a smiths anvil stand, as far as a steel stand goes many of them were welded up from scraps on a chunk of plate steel with legs, hoops, and flat bar. They served well but over time would get bent out of shape and even break.

The stands I designed and fabricate are made from one piece of plate steel, w/ 3 legs for self-leveling, and a basket for extra storage all for $375.00 If your buying an anvil also there is a $50 discount on the stand.