It depends on where you live. But, if you live in the US, it comes out on June 30th.
As to where you can buy your tickets, check your local theatre when the release date is closer. Mine usually sell them a month before, for Midnight Showing or the day it comes out. I doubt any place has them for sale yet. It's still 179 days away. :)
I only know that in the UK it comes out in June... doesnt that seem kinda quick to make a movie? I mean New Moon was out in November wasnt it? Oh, does anyone know when New moon comes out on DVD? -I no tht has nuffin 2 do wit da Q but i have 2 leave so i dnt hav tym 2 mak a new Q-
