We'll be taking a family trip to Tokyo and Nagano (Karuizawa) in a couple of weeks.

I've looked at Griffin and Heroic Decepticon's maps and figured out the easiest place to get to from where we are staying in Shinbashi is Akihabara so I've definitely made note of the places there to go look. If anyone has recommendations closer to Shinbashi or Ginza please let me know.

If anyone knows of places in Nagano I'd love recommendations there too (although looks like the area we are staying is all boutique clothing shops - bleuch)

Questions I have are:
How do prices compare to Hong Kong?
Are there any particular Optimus Prime figures people recommend I should be keeping an eye out for in Tokyo that might be cheaper/easier to find than in Hong Kong?
Are the Mandrake stores kid friendly? My 8 year old wants to come Transformers hunting with me.
Will people know what I am looking for if I say Transformers? (alternatively can someone give me the phonetic way to say Transformers and Optimus Prime in Japanese?)

Does anyone know if I can order items (eg from Takara Tomy Mall) and have them delivered to my hotel with the hotel holding the package(s) for me until I arrive? (I know some places in HK allow this but not sure if the practice is common in Japan.)