A good reference i normally use is kakaku.com. Some of the stuff online can be cheaper in Japan for instance Nikon filters. Some lenses esp 3rd party lenses can also be cheaper. The last time i bought something from Tokyo was in Mar this year. Got the D90 body at USD$750 which was about $1100 then. Think at that time, SIN was selling at $1300 plus. Places like Biccamera or Yodobashi ain't exactly cheap although they do give 10% pts which goes towards your next purchase. It's not worth it at these stores since the pts wld be used on something which is typically 10% more expensive than other places.