The game will, as you read this, already be sitting on store shelves across America, for the reasonable price of $20. And if you likes things a little more portable? PopCap also confirmed that an iPhone version of the game is on its way, and should be on the App Store in "late 2009."
Finally, as a bonus: here's a couple of Plants vs Zombies shirts, newly-available from PopCap's store. Moustache mode? Yes, please.