Amazon Japan 2018 Physical Comic Ranking
Amazon JP had released their ranking for physical comics (manga) for 2018, the aggregation period was ( November 13, 2017 - October 31, 2018).
They had also released their ranking for digital comics (series).
I am almost certain Amazon is not included into Oricon ranking so this list is quite interesting to see where and where doesn't it matches up.
1. Yotsuba&! #14 (Azuma Kiyohiko)
2. One Piece #89 (Eiichiro Oda)
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3. One Piece #88 (Eiichiro Oda)
4. Attack on Titan #25 (Isayama Hajime)
5. Attack on Titan #24 (Isayama Hajime)
6. Attack on Titan #26 (Isayama Hajime)
7. One Piece #90 (Eiichiro Oda)
8.Hunter x Hunter #35 (Yoshihiro Togashi)
9.The Five Star Stories #14 (Mamoru Nagano)
10. Dungeon Meshi #6 (Ryōko Kui)
11. Hunter x Hunter #36 (Yoshihiro Togashi)
12. Kingdom #50 (Yasuhisa Hara)
13. Kingdom #51 (Yasuhisa Hara)
14. Kingdom #49 (Yasuhisa Hara)
15. Berserk #40 (Kentaro Miura)
16. Ojisama to Neko #1 (Sakurai Umi)
17. Otoyomegatari #10 (Kauru Mori)
18. St. Onii San #15 (Hikaru Nakamura)
19. Hyakushou Kizoku #5 (Hiromu Arakawa)
20. Kinō Nani Tabeta? #14 (Yoshinaga Fumi)