At my local feed store they sell a trace mineral salt by Mortons. I have been looking for a cheaper salt that I can give to my bucks. I will be offering this in addition to a loose mineral mix so don't worry about that. It is also a loose salt, not a block. I don't like that there is no selenium in it, and I wish there was more iodine, but I bought a bag of it anyway to see how they do with it. What do you guys think?