Although It is a Japanese text site, shichigoro-shingo’s artbook and postcards are put on sale in the “Village Vanguard” Online store.
They are the artbook “GURUGURU” and 20 kinds of postcards.
P.S. And Art book “GURUGURU#2”.
Please check this site, if you stay in Japan and you are interested in. :D
shichigoro-shingo (Village Vanguard Online Store) 
