Canon EF 100mm f/2.8L Macro IS USM Lens
[Rebate $70, price now: $979.00]
I have this lens and really like it for it's macro capabilities.
Canon EF 70-200mm f/4L IS USM Lens
[Rebate $100, price now: $1,249.00]
The f/4 70-200 often gets overlooked because of the fantastic f/2.8 lens from Canon, but there's a couple of advantages to the f/4 lens; it's half the price, and half the weight (1.67lbs vs 3.28lb).
Canon Normal EF 50mm f/1.2L USM Autofocus Lens
[Rebate $120, price now: $1,499.00]
At f/1.2 this is a pretty neat lens, though I think I'd be more interested in it if I had a full-frame camera, rather than a crop-sensor, which turns this into an 80mm lens.
Canon EF 85mm f/1.2L II USM Autofocus Lens
[Rebate $150, price now: $2,049.00]
I'm sure this is a great lens, but it's too expensive for me because it's not really a lens I think I'd use much.
Canon Super Wide Angle EF 14mm f/2.8L II USM Autofocus Lens
[Rebate $160, price now: $2,199.00]
Love to have this lens, but it's too expensive for me!
See the full list here: Lens & Speedlite Instant Rebate