The African Queen
still isn't out on DVD here in R1, and neither is the 1927 version of The Jazz Singer
. (With the exception of King Kong
, due out next month, they're the only two left from that top-100 list
that aren't on DVD.)
All the other films you mention either are or have been released on DVD here. If you can't find them, maybe try Netflix? Though you might want to hold off on Ran
until you can rent the upcoming Criterion release; with any luck, it should be a significant improvement over the (ungreat) current release.
As for the differences in lists, IMDb's list is based on user votes; I don't know whether the AFI list is tallied from critics' votes or whether it's just compiled by fiat.