Most of these are made for the Korean and Russian market. So, you will find these sold on the secondary market like ebay or amazon. You can even order from alibaba express or similar sites direct from china, but I would caution against this unless you know what you are doing as it offers very little protection from fraud.
Try dashcamtalk.com for lots of info. I purchased an iTronics from the seller apple-ct on ebay. As far as I can tell there is not one product that is perfect, so you really need to do your own homework and pick the one that is best for you. Hope this helps and good luck to you.
Also, I just saw this thread,
http://www.ft86club.com/forums/showthread.php?t=35647