Most Steel Market's have a used retail or new retail TUBING / SIZE / STRENGTH input line. Small dishes use thin tubing; if you fill them and pack concrete into them;; they still need to be the perfect O.D./I.D. (outside/inside) diameter with the thickness of the metal and type of metal used; new / used / pipetube. I would love to see a stainless tube at all the supplier's; as it is more expensive than anodized/zinc on the weather protection. Just put normal steel in at the beach, then...for any period of time...
Locally, recycle...green light specials