Driving to an airport, how do I get a good deal on a rental car?

Hi, I am going on a flight out of the country in 3 months and I don't want to leave my car in long term parking for 10 days while dishing out $70 or more. I heard getting a rental car and driving it to and from the destination is the best option. I live about 200 miles from the departing airport. What are some good options for my situation and some advice? Thanks :)