I'm English so I'm not super familiar with US prices (which are probably better than UK prices) but my experience has been that European things like Leica will be the same price or more expensive than at home.
But some Japanese things are way cheaper - good quality 35mm compacts, some medium format (Japanese brands like Fuji, Bronica, Pentax), and third party l39 or M lenses
The cheapest camera shop in Tokyo is, I think, Fujiya Camera in Nakano - I'm sure a Tokyo resident will step in if I'm wrong.