Summary review on Esci kit:
Collect-Aire has expressed intent to produce a 1/48 FJ-3, selling for $120.
There is a Falcon conversion set that includes a 1/72 FJ-3 vacuform fuselage - no wings, stabilizer, landing gear, decals. I haven't tried it yet.
There is a very complete 1/72 resin FJ-3 kit from RVHP (Czech Republic) if you can find one.
You can get to an XFJ-2 from an F-86 without too much work...