Good auctioned ones with complete parts must be around 120k. Engines normally require general overhaul or atleast head and carb rebuilt (usually the engines are swaps). Trans and axles are mostly good to go. Wiring and electrical components are usually required to be replaced.
Restoration cost would depend on what you are going for (replacing engine, gearbox etc). These jeeps are customizable to a great extent.
What model is it? Could be M38A1 (military version of cj5 looks same as cj5 with waterproof f head engine and reverse shackles).
Hope this helps.