I found a '96 Explorer that a guy was parting out, for $100 with the springs and disc brakes. I could have had the sway bar and parking brake cables as well, but it was 20 degrees and I didn't want to dink with it.
I am putting a pinion seal and axle seals in it while it is out but it didn't really need them, the bearings look perfect and the ring gear has a really nice pattern on it. Clutch kit was $60 from Carquest.
Looks perfect inside, as far as I can tell hadn't seen daylight since it was put together, and had just under 100k on it.