A surprise box of Japanese stationery might be popular in the US. No hard data here but I've seen a recent trend of Japanese stationery stores open in Japan [0] and vendors opening physical "antenna" shops here in the West Coast of the US. And, crucially, my pre-teen daughter is obsessed with them. Gambatte!
[0] http://tsite.jp/daikanyama/store-service/tsite-en.html [1] http://www.mymaido.com