does anyone have a ballpark of how much I'd be charged to replace the front springs on a '92 acura integra LS? This would be at a garage - not the dealer.

It depends on what your looking for.
Coilovers which are shocks and springs togeather and are adjustable run in the $1000-2000. A decent Spring and Shock set will be about $500-1500. AirBags can cost alot more depending on what set up you have. Some where around $2500-5000. Try eBay Motors or searching Google. Arospeed, Eibach, H&R, there are many. you could try google too.