Clover Plots
If you're a hunter, establishing a clover plot is one of the cheapest ways to feed deer for hunting. Clover primarily is a summer food for deer, but they'll eat it in the spring as well. You'll need at least an acre of land to plant clover on to attract a reasonable number of deer.
Corn Plots
Corn is another cheap food for deer. Unlike clover, corn is a good winter food for deer, so if you're hunting during the winter, you'll want to plant corn for the deer. You'll need about an acre of land to plant and establish a corn plot. Don't plan on eating very much corn if you're using the plot to attract deer.
Deer feed
If you just enjoy the company of deer, you can purchase deer feed at outdoors stores around the country. It's similar to other animal feed. You'll need a trough or some kind of animal feeder to distribute it to deer.
Home Made Deer Feed
If you really feel like treating the deer in your area, purchase some shelled corn and mix it with molasses. You'll also need some kind of animal feeder to distribute this to the deer in your area. Be warned, though, deer will fight over sweetened corn.