You can make a great mix yourself from products readily available from any farm oriented feed-seed store. A 50# bag of plain salt (NaCl), a 50# bag of Di-Calcium Phosphate, 50# bag minerals intended for use on lactating dairy cattle which will be high in calcium content. Mix these and you'll have 150# of a mineral supplement that deer will both use and will provide them with minerals that they need for a strong healthy body at a fraction of the cost of 150# of "Trophy Rock" or "465" (pulverized "Trophy Rock"). About $40.