Transformers already out on DVD?

Optimus Prime rocks.

Not that I am complaining, mind you, but I was walking into the grocery store this morning and I saw that this summer's biggest blockbusters are already out on DVD. Doesn't this seem a bit fast on the turn-around time? I seem to remember it taking about 7-10 months for a movie to go from theater to DVD. Transformers came on in July. That's three and a half months ago.

Again, not that I'm complaining. Having kids means not going to the movies. Ever. So the shorter that turn-around time gets, the better for me. But still.

Wow.