There’s a Nikon 11/2000mm Reflex-Nikkor-C lens for sale on eBay. The price? A mere $19,950.
This page has more information on this rare lens:
This is the longest reaching and the largest dimension Nikkor optical lens for 35mm photography [...] This rarely seen lens was believed to be hand made and on a special order basis. It was generally been seen finished in white colour which carries the purpose of minimizing thermal effect if use frequently in the field [...] Neither the lens is easy to carry along nor friendly to handle as its dimension and weight factor often require time consuming setup for shooting.
The thing isn’t “easy to carry” because it weighs about 39 pounds. It’s also fixed at f/11, so you’ll need good light and stabilization to use it effectively.
(via Nikon Rumors)