We have experienced the same problem with the price of corn in our area. There are some great ideas with the peanuts and persimmon, we've even had luck finding late season apples that people let us gather up off the ground for free, they can be hard to find but work great when you can get them. Most of what we hunt is CRP grassland with no opportunity to plant a foodplot. Last year to offset the price we decided to cut the ammount of corn we threw twice a day in half to only about half a pound twice a day. We set our timers to go off later in the morning and earlier in the afternoon. The biggest thing for us is putting out just enough corn to get the does in a pattern of coming through. We saw more quality deer during shooting hours once we made these changes. I suspect most of our success came from the change in feeder times, but never-the-less, we used half the corn and had one of the best seasons in years.