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Amazon.com has Rokinon 12mm F2.0 NCS CS Ultra Wide Angle Lens (various mounts) on sale for $ 289/$ 298. Shipping is free.
Available Mounts:
Canon EF-M Mount (Black) $ 298 [amazon.com]
Sony E-Mount (Silver) $ 289 [amazon.com]
Micro Four Thirds Mount (Black) $ 298 [amazon.com]