You can purchase direct from Silicondust.com. I purchased through
Amazon. A Google, Yahoo or Bing etc. search will show other retailers.
As I mentioned earlier, I own the older HDHR-US Dual. Silicondust has replaced this with the
HDHR3-US which is generally reviewed well. I don't own one yet so I can only offer the one complaint that I do not prefer the internal splitter, I would have preferred the inputs to each tuner had remained independent.
UPDATE: see post #17 this thread