Free: Contests & Raffles.
400 your still bragging about that purchase!
As "Hunterrcc" recommends, use loose salt. Trace mineral type from a feed store. It will be red or reddish brown just like the Block salt. Don't really need to worry about keeping it dry. Deer and Elk will come and lick at dirt. I've had some spots for several years and always see activity in the spring at my old sites (i.e., before I start dropping more for this season). For deer and Elk, alfalpha cubes work great too. Again, feed store will have weed free cubes in 40 to 50lb bags. Easy to strap to the pack frame and haul into back country. I also get lots of bear pics in the summer time too.ET