Go to TSC buy 50 pound bag of white cattle salt.  Runs about $6.00.  50 pound bag of whole corn around $9.00. Peanut butter $4 walmart.
My Salt Lick
Set your trail camera up about 2 feet off the ground just in side the wood line.  Take a gallon container half salt half Corn.  Pour out a line about 20 feet right in front of the camera.  Set the peanut butter log in the middle of the salt line.  The deer on my farm will walk up and down the salt line 2 time a day.  I have my camera set at 30 sec.  I get about 12 shoot of each deer that hits the lick each time.
Peanut butter work great to get the deer to find the salt lick.  What I do is take a log drill 3/4 inch holes about 3 inches deep.  Take a spoon and smash the peanut butter in the holes.  Deer will come from all around to check out the smell of the Peanut butter.