Just shooting the keyboard section at Tsukumo PC Store in Akihabara. This store, in my opinion, has the best selection of keyboards in Japan, even better than Yodobashi Akiba, which is also a 'must-see' place for keyboard hobbyists.
Side story: I went there thinking of buying a REALFORCE89S-10th (Realforce's 10th anniversary model), but instead ended up purchasing a REALFORCE108UD-A, which had a far superior feel in typing. Though I did do some internal modifications, it is now one of my favorite keyboards :)