20% off select Sigma lenses when bought together with Canon DSLRs

There is a new promotion at Amazon, if you buy one of these Canon DSLR kits together with one of these qualifying Sigma lenses, you get a 20% discount on the current price of the Sigma lens. There is no coupon code to enter, simply add to cart and the 20% off discount will be shown at the top right corner of the Amazon Checkout page. This promotion is good until May 5, 2012.

This promotion is stackable with the Canon Instant Rebates.