where to get sushiro / conveyor belt sushi souvenir plates in tokyo?

odd question but ive been obsessed with sushiro / conveyor belt sushi here in japan and want to take back one of the plates as a souvenir for home, is there any specific area/store that i'd have the best chance? it doesn't have to be sushiro specifically but would be nice

I remember seeing this book that included three plates at a random store in fukuoka but didn't buy it and have been regretting it ever since 🙁 any help is apprciated!

by zantosnyteblade