You already witnessed our unboxing and hands-on with Sling Media's Slingbox PRO-HD, and if you're anxious to know when you can grab one of your own, how's about right now? Sling has revealed that its $299.99 high-def box can be purchased this very instant from its website and other B&M retailers, and for Canadians feeling a touch left out, take heart -- you all will be able to purchase the unit "in the coming weeks" for $329.99.