I also bought a '76 without hard doors or a hard top. It did have soft doors and a past-its-prime BestTop soft top, but I opted to wait it out and watch the classifieds and craigslist. A few months later an abandoned project showed up on my local Craigslist and it was a hodge-podge of '72 parts, but I got a great deal on a full tub and early doors (which i like better aesthetically speaking) and they will fit a later '75+ FJ40 with a little tweaking. I'd definitely do a search on the classifieds here for past sales to get a feel for going rates, and have the cash ready to pounce in a few months (or years) if something pops up in your area. Shipping via Fastenal is pretty reasonable and easy if you find a can't miss deal. Good luck!
I recently sold a very nice set of later doors to Icon Toyota shop for $750. Just for comparison. eBay has door sets quite often but they are heavy to ship $$$$. Best to find local, bought my top for $75 bucks, it was taken apart and sitting behind a garage. Keep the eyes open.
I happen to have a nearly completely repaired (not restored) top (need to spray the white), a set of old style doors (original/fairly rough), and back half doors (good/vgood original). They've all been there for years, while my rig has evolved into a straight up wheeling rig.
I haven't posted them for sale yet, but will when I can get them out to take pics (we're having a small snow storm right now)