I make mine.
When smoking other foods I just place a tray of Malden or Rock Salt on an empty part of the WSM.
I then use the salt when cooking/preparing other food rather than adding it to BBQ.
Surf'n'Smoke BBQ Team
Weber Smokey Mountain Cooker
Weber One-Touch Platinum Kettle - 57cm
Weber Smokey Joe Silver
Film Noir. Back when men were men and broads were dames.