There are only about 20 copies of the very rare Canon EF 1200mm f/5.6 L USM lens in the world. Canon made only a handful of them to test its viability. By the way, this is not the only 1200mm lens Canon had manufactured. They had also experimented with the FDn 1200mm f/5.6 lens, with a built-in extender during the 1984 Olympic Games in Los Angeles. This was the ancient forerunner to their current EF 200-400mm f/4L IS 1.4X Extender USM lens that went on sale in 2013. I love this amazing Super Telephoto lens.
The people at B&H Photo in New York is selling a copy of the EF 1200mm f/5.6L USM lens for US $180,000. If you have some spare cash lying around, you may be interested in this lens. You can charge this purchase on your credit card and shipping is free.