Adorama via eBay has a great deal on old version of Canon EF 100-400mm f/4.5-5.6L IS USM lens.
Canon EF 100-400mm f/4.5-5.6L IS USM lens – $1,299.00 – at Adorama via eBay
Adorama via eBay is Canon USA authorized dealer, you will get 1-year warranty from Canon USA.
Regular price for EF 100-400mm f/4.5-5.6L IS USM lens is $1,499 at most US stores.
The new version of EF 100-400mm II is $2,199.