Roku's HD-XR doesn't add much to the overall Roku HD equation, but if you've been holding out -- just waiting, patiently -- for the perfect time to snag yourself yet another movie set-top-box, today's the day. Actually, right now is the moment. Roku is offering its newest STB for an unheard-of 50 percent off, but it's only for the first 500 customers who pony up and purchase it through the outfit's website. For this very moment in time (starting at 11AM ET and continuing until 500 HD-XR units are claimed), the box will be priced at just $64.99, and as if that weren't good enough, Roku is also covering the shipping. Need the specifics? Click on past the break.