I agree with PopCornShop.... I went to Japan a couple of years ago, and the amount of Coca Coal stuff was PLENTY, but just about all was repo or new.
We did have a good time looking at a antique sale we ran into. But again, all we did was look, as nothing really caught my eye (my wife on the other hand loved everything.) Different culture, different tastes, different vintage things.
Either way, have a great time, dont eat anything purple, and take some cool pics!
P.S. If you find that guy there that made all those knock off RC plates, tell him to please stop.