Hey!

Right now I would say that carnival celebrations -> capsules is the cheapest way to obtain shisui susano.

I can not tell you an exact drop rate for him since it is variable depending on the items on the board. the 8 slots (excluding shisui) on the board influence his droprate.

Rare nin include: TTJ Obito, 6P Pain, Sus Shisui, RS/5th Tsunade, GNW Orochimaru, Kimono Kakashi, Black Zetu, AS Neji, Taka Karin

Common nin include: SS Sai, 3rd Hiruzen, SS/YA Konan, 4th Minato, EGF Kakuzu, Hallo Kabuto, SS Mei, Shark Kisame, YA Jiraiya, Chinese Hinata.

Rare items include: Charm packs, refine packs, seal scrolls, cloth, threads, summon scrolls, cave keys, and gold dusts. Common items include: vials, purification runes, magas, summon frags, ss pages, myobokus, stam pots, purification protects, gold vials, bells, and training pots

note: unlisted are somewhere between rare and common

CREDITS GO TO Tenkz#5898 FOR COMPILING THIS INFORMATION

You should be looking for rare items so you can drop Shisui more frequently