Thanks to Rob for pointing out another one of those hidden Canon lens deals. This time it's for the Canon 10-22mm F/3.5-4.5 USM Lens. Keep in mind this is an EF-S mount for APS-C Canon cameras like the Canon 7D, 60D, T4i/T5i Rebel, etc.
It can also be used if you're rocking the BlackMagic Cinema Camera EF mount, or to get a wider view with cameras like the Pocket Cinema Camera (3X crop) & Panasonic GH3 with a smart adapter like the Redrock Micro LiveLens MFT Active Lens Mount.
Not the widest, nor does it have a constant fixed aperture, but it's a very sharp lens. Typically with these wide lenses, I'm always stopping down to F/5.6 anyways for Stabilizer use. Here's a 3 year old uncut BTS example of this Canon 10-22mm lens at work on a 60D with a Glidecam HD4000.
Normal MSRP puts this lens at $649 minus -$50 instant rebate, but as you proceed to the checkout (you must proceed to checkout to see price change) it drops down to just $529 (found here).
Canon EF-S Wide Angle 10-22mm F/3.5-4.5 USM Lens
FYI, there's also a checkout discount for the Canon 85mm F/1.8 Prime USM Lens. This lens will work on both APS-C and Full Frame Canon cameras. Following the checkout shows the price dropping it down to just $334.99 (found here)
Canon 85mm F/1.8 USM Prime Lens.