Can't buy Blackmagic Xbox 360 Capture Card for my laptop

[any ANONYMOUS forum user]

Okay, So I recently bought a Dazzle recorder to record my xbox gameplay, however I hate playing in SD and the quality after uploaded to youtube is horrible. I was considering buy a BlackMagic Intensity, the one with the USB connection, but I was wondering if it will work if I use it with my laptop and just plug it in there? I want to be able to play in HD with my HDMI and also record in HD, preferably 720p. Any knowledge about what I should do or should buy would be appreciated.

P.S. Where can you purchase a Black Magic Intensity at? I've searched around on the internet and cannot find a place.