The Ultrawide Rokinon 8mm and fast 85mm F/1.4 lenses are back on Lightning Deals. These deals have always proved to be the cheapest price you'll find for these lenses. These deals only last for a few hours or until the quantity is sold out. You might find that it brings you to a Nikon mount deal, but no worries. Rokinon are all manual focus lenses, and the Nikon mount can fit on Canon bodies with a very thin and simple adapter like the ones (seen here on Amazon).
The Nikon mount can also fit pretty much everything else without a complicated adapter like a Sony FS100 down to a Sony NEX7 or GH2. Check it out at the deals page via Amazon (Click Here).
Amazon Lightning Deals