We used to get blocks from a feed store near our property that were pretty close to what you list. Came in 1'x1'x1' blocks and costthe sameasthe Deer Cane blocks 1/6th their size. These were not regular salt blocks, but salt and mineral blocks. Only maybe 40% NaCl by volume. The rest was minerals. The deer would have them knocked all over and kicked to pieces, and every piece gone in a short time. Nice thing about them is that they wouldn't dissolve in the rain too fast, but they did leach enough into the soil to make it pretty active there.