Aye, I keep meaning too. I probably will after I get over the fact my hair has been cut and I let my sister decide on the style. I'm officially sad now.
Once for every film :P Yeah, you definitely should, I remember after my old au pear stole the Prisoner of Azkaban it was really annoying having to go out to get it whenever I wanted to read it because the library's ages away and I just wanted to carry on reading xD