I bought the Timbrens from a web site quite a while ago but I wouldn't reccomend them. I did a quick search and found this site and the price looks pretty good.
www.Torklift.com
Update: I like the idea of putting the Timbrens on and forgeting about them. I had air shocks on a Bronco once upon a time and I had to air them up with a load and let the air out when unloaded. Unless you go to the expense of an on board compressor, guages, wiring controls etc. air bags are not for me. Timbrens are working great for me for less than $175.00. Installation is simple about 10 minutes per spring. [img]/ubbthreads/images/graemlins/warmsmile.gif[/img]