Check www.collectorcartrader.com ... I found a nice 79 Golden Eagle Chief on there about a month ago for around $3000 in GREAT shape and all original.... I almost got it, then found the 80 W/T Laredo I now have for my wife.
Check Ebay as well.... they are always selling FSJ's
I have a 79 Cherokee Chief for Sale at the Ranch , Father and son are original owners. I think it has around 49,000 original miles. In very good condition for it's age. Runs a little rough. Only driven in Oregon and New Mexico No Rust. If you're interested I can get you more accurate info and some pictures and a price. Jeep is in South Central New Mexico