Canon USA direct store has a great deal on refurbished EF 600mm f/4L IS II USM lens.
Refurbished Canon EF 600mm f/4L IS II USM lens – $9,199.20 – at Canon Direct Store
This lens is refurbished by Canon USA, you will also get 1-Year Canon USA warranty.
Regular price for new EF 600mm f/4L IS II USM lens is $11,499.00 at most US stores.