OMG, physically hunting down the Jimoto mugs were so fun!
Went to Fukuoka for the first time last December. I got a private walking tour from Klook, and after I mentioned my hunt to the guide, she took me to Dazaifun Tenmangu and got the Chikuzen mug.
Went to Huis Ten Bosch and passed by Sasebo to get the Sasebo cup!
Bummer that I did not have time to go to Kumamoto! Mainly because I wanted to visit the Starbucks and at the same time buy a Jimoto mug. Tours were sold out to Kumamoto on my dates.
Hunting these down is like a Pokemon hunt, as much as I don't play that game. LOL. The Starbucks that sell these apparently also are either near special attractions or themselves somewhat themed!