Research in Motion used a press release this morning to announce that the BlackBerry PlayBook tablet is officially available for pre-orders starting today, with a launch on April 19. The WiFi versions of the PlayBook will be priced at $499, $599, and $699 for 16GB, 32GB, and 64GB, respectively.

The announcement is a joint production between RIM and Best Buy, the only retail outlet tapped to carry the tablet so far. The Wifi PlayBook will also be available in Canada on April 19 in Best Buy and Future Shop stores.