Anyone know any good places on Maui to get some energy drinks that are hard to find on the main land or are not the major drinks produced by Rockstar, Monster, etc.

I've never been there, but my guess would be that you may find some interesting stuff in the Asian grocery stores.

I too have never been there.
I would try the surfer beach areas and nearby villages. I'm guessing that the
young suffer crowds drink lots of ED's.