Mr. Roxy, I have to disagree with you somewhat. Having run a videostore for years I can tell you that the best time to buy a dvd is when it first comes out. You'll find most places like Best Buy will sell them below their cost (it's called a loss leader) to get people into the store. Different studios have different policies as to when they lower the SRP (Suggested retail price) of their product and some studios never do that.
I find now that the best way to buy dvd's is from Blockbuster or Hollywood video and I buy them previously viewed. One of those stores pretty much always has a "3 for $25" sale and that's better than any sale Best Buy could ever have. But if you want a movie when it first comes out, I would suggest getting it within those first two weeks if possible.
"Noah, someday we'll talk again. But there's things we'll never say. That sorrow deep inside you. It inside me, too. And it never go away. You be okay. You'll learn how to lose things..."