H&R and Eibach will drop ~1 to 1.2" with their lowering springs. They also make springs that are similiar to stock that hardly drop at all as well as "extreme" drop springs that are in the 2" range. Dropping a car over 1.5" is not recommended if you drive your car anywhere on the street.
So far, the best price I've seen for springs is from
www.tirerack.com . Matter of fact, they usually have the best tire prices as well.