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I know a few people who have gone the DIY route and bought cans of bed/wheel well coatings, put the car on a lift and went to town spraying the underbody. Just something to consider if you find out that professional rust-proofing is outstandingly-priced.
Midwest salty roads WILL rust out the car quickly and destroy bushings etc very quickly, Get a cheap beater that is disposable which is what I did when I lived in IL.
Also "rust proof" will make it worse as it traps moisture and will eat the metal up that way, I lived in the midwest almost all my life and went to college for collision repair tech and I got to see first hand what happens to a car from just 1 winter in this crappy envirment.