Mate, Pedders will charge around $480 to lower your car. Thats everything fitted. (Springs only, no shocks)
I have a 98 Fairmont Ghia, and have lowered mine 5 1/2" at the Front, and 6" at the back. Being so low, i had to roll my guards. I am running Pedders Lowered Sports Shocks, and KMAC Springs. I used to have Pedders springs, but it wasnt low enough, so took the pedders springs out, cut a few coils off them, put them back in the car. I was happy with the ride height, so i took the springs back out of the car. Took them to KMAC, and they made me new springs, the same size as the cut pedders ones. Takes about 2 hours for them to make the springs on the spot. So, now i have non cut custom springs in the car. Wasnt too expensive either. The Custom Made springs were $400 for the 4 of them. Mind you, i installed them myself. As previously mentioned, its is a pretty straight forward process to do it yourself. Also, you get to learn about the car in the process!
If you have any other questions, feel free to mail me on firstname.lastname@example.org
For pics of my car, go to www.cardomain.com/id/droooz