the way i'm doing mine is 8" skyjacker front springs, 4" TC ez rides and a shackle flip for the rear. the fronts ran me around $400 from national tire and wheel, shackle flip is ~$200 with shackles, and the rears cost me a set of tires i wasn't gonna use. it might be easy to find a set of rear lift springs.
i would definitely search the hell outta craigslist for springs, but the shackle flip you'll most definitely have to get new or from someone here. the easiest way to go would probably be to buy a full 8" kit with 4" blocks, then get the shackle flip and substitute those in.