I found mine on autotrader using advance search for liberty with diesel for fuel type, there are a few out there, carmax has some also. You should be able to find a nice clean low mileage one for under $15k

emp1134's Sig:

2006 3500 Black Sport QC 4x4 G56 dually, Amsoil w/bypass, CON OFE,Mag-Hytec on rear, pyro boost & rear diff temp gauges, AeroTurbine 4040 in place of cat, high idle, K&N cold air w/EaAU 4095, QUAD boost fooler, Rancho RS5K's, DS Predator/puck stack
2006 CRD Liberty Sport 4x4
United States Air Force F-16 weapons armament specialistmarch 2001-may 2005

I said that as soon as a domestic automaker produced a diesel that was geared toward MPG not just for towing I would buy one. Then I did. By far the most versatile vehicle I have ever owned. 20+ MPG, great off-road ability and I also tow my 19' fiberglass walleye boat.

Have a 05 and love it. But have had EGR issues, which was covered under the extended warranty. The dealer that I bought it from, Jeep pulled there dealership, and the Jeep dealers that I talked to was clueless when it came to the CRD. I did fine a mom and pop dealership which is 50 miles away from where i live but they do all my work on Lil" D ". Seems like the bigger dealerships are not geared to customers but money. Have done some mods and in the process of installing a programmer. I'm talking to 2 companies. But am swaying to 1, they can detune the EGR and other mods ,as needed, not cheap but you can return the EMC to stock if needed. Not pulling the ECM and sending it to them to reprogram. Getting 25 to 30 mpg. Will post after mod is done