Airports are generally one of the worst places to get a good price on ANYTHING. Remember, you can't go to the duty-free shops at NRT (if they even have cameras) unless you're LEAVING Japan.

On one trip to Japan, I dropped my camera on the sidewalk and irreparably damaged the lens and focusing mechanism. (Two camera shops told me that it would be a hassle to fix because it would need new parts.)

So I went to Yodobashi Camera (their repair department told me that they could fix the camera for somewhat less than buying a new one, but that it would take two weeks, and I had only another week in Japan), and while they didn't have my exact model in stock, they did have one with comparable features. Being on a tourist visa, I was exempt from consumption tax, so I got a slight break on the price, but all in all, it cost about the same as it would have in the U.S.