I never heard of seller, but it's one heck of a deal on eBay.
Thanks for that update! That's $400 well spent. So now I have two. I hope Yongnuo comes out with their version of the ST-E3-RT soon
I don't know much about flash photography, it seems you either need 2 of these to use as a master and slave or a transmitter on the camera. What's a good transmitter to get and how much do they cost?