JAPANESE OFFICIAL CLUB STORES
Here is a non-exhaustive list of Japanese football clubs and their online stores. I will add more clubs once I have time or if a particular club is asked for. Note that not all teams have an online store and as such can't be posted here. Also with regards to Japanese teams I will only be focusing on the top division teams at this point.
Albirex Niigata
If you're looking to buy a club football shirt for Albirex Niigata then look here.
Note: N/a
If you're looking to buy a club football shirt for Cerezo Osaka then look here.
If you're looking to buy a club football shirt for F.C. Tokyo then look here.
If you're looking to buy a club football shirt for Gamba Osaka then look here.
Note: Store is only in person.
If you're looking to buy a club football shirt for Hokkaido Consadole Sapporo then look here.
Note: There is an English version but they only deliver to Thailand.
Júbilo Iwata
If you're looking to buy a club football shirt for Júbilo Iwata then look here.
If you're looking to buy a club football shirt for Kashima Antlers then look here.
If you're looking to buy a club football shirt for Kashiwa Reysol then look here.
If you're looking to buy a club football shirt for Kawasaki Frontale then look here.
Omiya Ardija
If you're looking to buy a club football shirt for Omiya Ardija then look here.
Note: Only in person.
If you're looking to buy a club football shirt for Sagan Tosu then look here.
If you're looking to buy a club football shirt for Sanfrecce Hiroshima then look here.
If you're looking to buy a club football shirt for Urawa Red Diamonds then look here.
If you're looking to buy a club football shirt for Vegalta Sendai then look here.
Ventforet Kofu
If you're looking to buy a club football shirt for Ventforet Kofu then look here.
Note: In person only.
If you're looking to buy a club football shirt for Vissel Kobe then look here.
If you're looking to buy a club football shirt for Yokohama F. Marinos then look here.
If you notice any links that either aren't working or need to be updated then don't hesitate to contact me so I can amend them so this list is constantly useful to people buying club football shirts regardless of what club they are looking at.