A seller on eBay is offering up a Nikon 1200mm F11 super telephoto lens, dating back to the 1970s. A separate AU-1 focusing unit attaches to the lens and drives focus, and is included for the seller's asking price of $5,750. Naturally, the lens features a revolving tripod socket, since your chances of getting sharp images while handholding it would be slim-to-none.
If $5,750 is a little steep but you're itching to add... more