How rare are 6 lug 16in 3 nub wheels?

[RedRoad]

Been trying to find some stock 16in wheels for a long time now with no luck. It seems like the later 4 nub 16s are SUPER rare but the earlier ones seem to be just as difficult to locate. Looks like they are special order not regular production which is why there are less out there. Why would someone order that size wheel at that point in time? Different tire availability?

Im going to check out a set that the owner does not know if they are 15s or 16s. Being fairly rare what is a fair price to pay these days? Ive heard that the Power King 9.50x16 tires are no longer in production (which was the reason I was looking for 16s) but can also run the new BFG 7.50x16 or 255/85s which has the factory pizza cutter style.

Any info appreciated, wish me luck!