When Rode released it's VideoMic Pro, the little shotgun mic was sold out for weeks. I'm anticipating the same would hold true for at least the innovative VideoMic HD with built in digital audio recorder.
Through the comments, it looks like the Rode Stereo VideoMic Pro has now been listed for pre-order and comes in just shy of $300 dollars (found here).
There's also a product listing for the VideoMic HD with built in Digital Recorder, but no price has been listed yet. You could of course check in and get notified when it becomes available following the link (click here)