Availbility of Yukihiro Sawada films on VHS/DVD/LD?

[Miles Wood]

After recently viewing the exceptional 1978 film PANIC IN HIGH SCHOOL
(others may disagree with my enthusiastic response) I anxious to see
more of  Yukihiro Sawada's work...it seems like many of the films he
made for Nikkatsu in the same period would bear much closer relation to
PANIC than those of co-director Sogo Ishii. However a search of the
Nikkatsu RomanPorno database reveals none of Sawada's films are
currently available on sell-thru VHS (nor DVD). Were these released as
rental (and thus,  if lucky, perhaps picked up from one of Tokyo's used
video stores) and are there any other of the director's films available
for purchase?

Thanks.

Miles