>>7995779The main kits to not ever, or very rarely get reprints are ones with experimental technology that didn't really last. The speed grades and f90 kits with multi-channel plastic I don't think I've ever seen get a reprint. The old 1:100 Nu with the metal crotch is also not very common to see. A lot of SD kits never got re-printed, since exclusivity was apparently part of their appeal.
Last shooting looks like it's multi-channel, so that makes sense for it to fall out of production.