I thought you meant for round bales. Sorry. I was thinking about bringing a semi up to get a load at that price LOL
I have tried the little alfalfa cubes in the past the deer didn't eat them. I checked they hit the bale a little last night.
The problem with corn if consumed in mass quantities it can upset the balance in the rumen and kill off the good bacteria that helps in digestion. The best way to avoid this is to limit the amount of corn available. But to answer the question a good alternative is baled alfalfa as some have pointed out as well as oats and dried soybeans. They can be expensive though. Either way if supplemental feed is made available them it should be kept dry if possible. Anything laying on the ground and left wet will mold an that aint good for the deer. They will avoid it in most cases but when really cold the temptation might be to much if other forage is sparse. Personally I don't think corn is bad but anything in large quantities can be bad for you right? Same applies to other animals. Of the alternatives alfalfa bales seems the best to me. Still roughage and contains some protein and some carbs to keep the furnace burning. If you only have corn you can try mixing in alfalfa pellets as deer might not eat the pellets straight out if not used to it. You can slowly increase the ratio of pellets to corn over time and they will eat the pellets. Here once again the food needs to be kept dry.