dibilo SG hahaha wah kaoz... steady sia... in tokyo still support sgforums ah hahaha. anyway i think you can ask the hotel reception about places to go to, to get these sort of stuff. they'd probably know better.
JasonC SG can try akihabara, just after the electronics “lane” (after you exit from the railway station)
I-like-flings(m) SG ueno better.. got a shop near the station.... 6 or 7 th storey high one.. whole shop selling toys.. got 1 or 2 floors all for model one.. but not cheap.. if u want model.. try hk or taiwan alot cheaper