Pretty sure the 3.8 factory has been shut down.
But I bet you can get remanufactured ones pretty cheap--check with jasper engines, and google "remanufactured engines" generally.
Also, what are you looking to spend? Now would be a great time for a hemi swap. With used parts, I understand it can be done for around $13k--new parts clock in in the low $20k area. Google "jeep speed shop" to get a sense of what's involved in a used hemi swap, google "Burnsville offroad" for new.