Free: Contests & Raffles.
Lots of threads on this but I will just say that I like the 50 lb bags of salt with selenium. Often cheaper then the blocks and lasts longer.
Your a bit late for this year. The animals need for salt greatly diminishes as summer goes on. Usually by late July pictures are all but nonexistent over salt alone. I use bags of trace mineral salt though.
The need in my area on the deer side of it has already dropped off greatly . My cams avg 1000 to 1400 pics from may to early July .. Now some cams are down to 200-300 pics. Elk seem to hit them longer. I use 50lb trace bags with SE