Where videogames are concerned, thinking you have plenty of time and "I'll get it later" isn't always the best course of action. My credo is to buy things I want when I see them, or be prepared to never have them. Because sometimes stuff just disappears, or you get screwed, or some other random thing happens and you end up missing out because you waited.
Head to an EB or wherever you buy games and order one. Don't wait.