You can replace the air bags with coil springs, see the above link for pricing.
air bags are easy to change. $100 each lifetime warranty. if the leak goes on to long the air compressor will burn out, $150. I have done it on my 1993 and on a 1996. Less time then changing to springs.
Looking for a Used Town Car in your area?
CarGurus has 2,377 nationwide Town Car listings starting at $1,542.
Search Lincoln Town Car Questions
Lincoln Town Car Experts