But one thing for sure; all the parts are 100% authentic.

I really haven't thought of buying performace parts at Tokyo; so haven't pay attention to the price. But I am sure not all the parts are off the shelves and needs to be ordered. Sorry don't have much information. But have fun, sure you will enjoy!

Dumb newbie question - I may be going to Tokyo later this year. If I do, would here be a cost benefit to buying any performance parts there?