When can I buy Harry Potter and the Deathly Hallows Part 2 tickets in Spokane, Wa?

My gf and I want to go to the midnight showing of the last harry potter. I'm sure that because its the last night I will have to stay up til Midnight to purchase the tickets but is there a date yet for when they will start selling the tickets online? (I've been looking on Fandango but nada!!)