B&H has the AJA Cion 4K/2K cinema camera for $4995 right now (reg. $8995). The AJA Cion records 4K ProRes video internally to AJA Pak SSD drives or 4K Raw video externally via 3G-SDI or Thunderbolt output.
At $4995 now, it becomes one of the more affordable 4K cinema cameras on the market. Check it out here at B&H Photo.