If you want to try a cheaper alternative I feed All Stock pellets. Works great for me as far as a feed supplement and is priced within a buck or two of corn at the feed store where I get it. Of course it won't have all the additives deer pellets have and 12% protein I believe.
If you want antler growth and all that good stuff, the book says 16% minimum on protein. When I was feeding I considered 16% as basically a maintenance ration, for growth, body and antler, I would recommend, 18% or 20% max including all the minerals and trace elements deer need. What is good for cattle or sheep is not necessarily good for deer. It's your money though.edited
I typed 29% earlier, don't do it. Anything over 20% is a waste of your money, it will not be digested and leave high protein deer pellets on the ground.