Brand new they are about 14K for a fully loaded model. But used they are not as bad. Mine is a 2004 that I bought in 2009 for 6k.
JHere is the Chalet RV page Chalet RV - Folding Travel Trailers for a TJ you would look at the LTW or the Arrowhead (what i got)
Aliner also makes one Aliner - The original A-frame travel trailer. They are a little cheaper, a little lighter and not as high quality as the chalet. But still a good camper.