If you want to mini-tub the car, the cheapest way is to do it yourself.
It's not an expensive job to do, just very labor intensive. If you've ever done it, it should take roughly 40-50 hours. If you haven't done it, expect 60+ hours. Ask me how I know?
Here's a how-to guide.
http://gearheaddaily.com/dat-ass-how...-in-your-ride/