So let's say you find a 95-97 80 with @220K on it, two owners with a clean body and virtually no rust underneath and absolutely none on the body or seam areas.
Not a bad price on the axles. If I were looking to lock an unlocked 80 I would skip the axles and go with either an ARB or a Harrop. Arguably better units and no removing the axle housings.
Agreed other low cost F/R locker option would be Aussie locks F/R but add locking hubs to front to disengage when not on loose surface. Could be done for about $1,400 in parts. Air lockers F/R and compressor kit is near double that.