I get all my stuff at the local AG supply store. I put out one trace mineral block, the rusty red looking kind. Then I also put out a block made for most livestock, can't remember the name but on the side of the block it has a pic of a cows head, horse and goat. It has alot of the same stuff in it most of the deer mixes has in it, alot of calcium, phosphorus, and others that deer need for racks and growth. They are both fifty pound blocks and only cost about seven bucks. I keep them out all year, but they only use them in the early spring and summer, come fall they stop. I also usually put new ones out in late Feb and sometimes in late summer or fall just to make sure they are kept available for them.