eBay seller "ala2200" has posted an auction for a Canon EF 1200mm f/5.6L USM lens (review). (thanks Matt)
Right now the top bid is only $2,025.00 – and that's especially reasonable considering the used value of the lens is upwards of $100K+.
Caveat Emptor: While the seller has a good feedback rating, it's not someone we're familiar with and the listing appears a bit suspect. We suggest proceeding with extreme caution when purchasing expensive gear from unknown sources.
Update: The auction listing has been removed.