When I bought my Jeep Wrangler back in January the finance guy offered the lifetime warranty for $2400.00 and Chrysler would give 24 months 0% interest.
The lifetime warranty was supposed to be $3400.00. There was a dealer(in Michigan I believe) was offering the Lifetime warranty for about $1900.00. Read about it on a Jeep forum. There were several forum members who bought theirs from him and they seemed to be quite satisfied. He did say he could not sell it at a discount in Florida due to state regulations governing extended warranties.
I did buy the warranty because I had a 2000 wrangler and in six years I had to replace the radiator, water pump, AC vents, and have the AC repaired. I didn't want to get a new wrangler without an extended warranty.