I am far from an expert but when in Tokyo I looked around. I did not think that it was cheaper then the US. Compared to big box stores I suppose it might have been slightly cheaper though not worth the hassle. I thought it was definitely more expensive then I could get from internet retailers. I realize you are in Canada but I would assume it easier to bring in goods from US then from Japan.

FWIW, My brother lived in Japan for 2 years as expat. His company paid to ship his entire house from tokyo back to US. He still did not find anything in Japan that made sense to purchase rather then purchase in the US. My two cents is that if you are looking to save money it won't happen. You may however find something not yet available in the US.