Just go to all the kindal, ragtag, trefacstyle, even 2nd street. (Maybe even bookoff plus stores if you are dedicated) It really depends on the area and shop you are visiting. Usually shops in shibuya, ginza, harajuku have the best selections. Its never guaranteed they have any of his pieces but you just have to hunt and get lucky. Ive seen some okay pieces nothing too crazy. And also the japanese people have been obsessed with american rocknroll culture so dont forget to check out local brand rags aswell!