Order early. Brag often. That’s what the pre-order page for the BlackBerry PlayBook says today. Hopefully we will be able to do this, so far it looks good. The 7-inch PlayBook will cost you less than $500 for the 16GB WiFi only model. You can pre order it from Best Buy and it will be rolling out to Staples, Office Depot and RadioShack shortly. In addition, AT&T, Sprint and Verizon will be carrying this tablet. The full list of where you can buy the BlackBerry PlayBook is shown below. What we would really like to know is when this model will actually be in our hands but there’s no date…