Well, the candy sold at Japanese groceries in the US is no different from what's available in Japan (it's all imported from there, after all).

His service would only make sense for you if you're not within driving distance of such a store yourself.

There are a lot of seasonal candies that are not available out of Japan. I don't live in the US anymore but when I did I never saw any of the more original candies in the Japanese groceries... For example, at one time, they had wine kitkats in Japan.