The B&W games were available for sale directly from SNK-USA. As someone else mentioned, it was all of them except Melon-chan, Master of Shogi, Dokodemo Mahjong, and maybe not Puzzle Link either. My memory is fuzzy and I've had conflicting reports about whether Puzzle Link was available (they would have had to translate it unlike the other games which had dual language ROMs).
I never ordered them from SNK-USA, so I don't know if perhaps they were actually the same as the English packaged games released in Asia. The only difference would have been a little one after the catalog number and maybe SNK-USA's address on the back. In any case, they wouldn't have had cardboard cases since those weren't introduced until later, around when Pacman came out.