If you want to get your hands on RIM's BlackBerry PlayBook, you might be running out of time. It seems that the QNX-based device is no longer available in the US from retailers like Wal-Mart, Best Buy, RadioShack and Staples, with Amazon and RIM's own online store being the exceptions. We're wondering if this means newer PlayBooks are in the works -- we've already seen updated 4G LTE models out in the open and recent OS updates
