The cheapest price on trophy rock is to buy Redmonds all natural trace mineral salt. It comes out of the same hole in the ground and 50 lbs is about $5-$6. It is the same exact stuff. It's also now the salt I use in my kitchen. I don't use the feed grade in the kitchen, but they sell kitchen salt. It's more finely ground than the cow salt. Nobody sells the Redmonds trace mineral around here. I stopped in TenerC on my way back through last time and got some at a co-op.
True Dat! Im in the trucking business and we have hauled alot of it. Both Rocks and bagged stuff