Canon USA today has dropped the price for 24 Canon EF lenses. You can save up to $800 on selected EF lenses, for example, $800 off on EF 200-400mm f/4L lens, $500 off on EF 400mm f/2.8, 500mm f/4L, 600mm f/4L lenses. This is a permanent price drop, not an instant or mail-in rebate.
See the list of price drop lenses below:
There is also an instant rebate on Canon non-L lenses, see the deal at B&H Photo Video