fr and rear coil springs

i jsut replaced the rear shocks and the driver side is stilling low. so i am thinking it is the rear coil gone bad. anyone have any that kinda of used or know of a place that sells them. also what am i looking at money wise to get them removed and replaced.
year one wants 300 for all 4
help fellas

would like to get this done before the snow flys.

 

http://www.buickperformance.com/springs.htm

 

thanks alot

 

I have a full set that I bought for my GS 455 and ended up not needing them.
New in the box for $200 plus shipping

 

do you hvae the insulators as well. or just the coil springs thanks

 

Don't know if you want them still, have a set of coils off my 72' you can have. I think I have a new set of isolaters too. 5 bucks for those, still in bag.
PM me if interested, sounds like you are on the same side of town. I have alot of other misc parts if needed?