B&H has loads of Sigma lenses with instant savings up to $200 off. For example, the 18-250mm lens shown above is now $349 (reg. $549). Additionally, B&H is handing out 4% rewards on these lenses. These deals are good through December 31, 2013. Check them all out here at B&H Photo.
Canon has kicked off another lens rebate program for fall 2013 comprised of over 40 lenses, along with several Speedlites. The deals include both mail-in and instant rebates. Check them all our here at B&H Photo.
Olympus has a number of rebates available on its Micro Four Thirds cameras, lenses and flashes right now through June 22. Instant rebates are available up to $150 off. Check them all out here at B&H Photo.
The Canon Lens Instant Rebates have been extended through June 29, 2013. Dozens of lenses, Speedlites and extenders have big rebates up to $300 off. Check them all out here at B&H Photo.
Tokina just launched a new rebate program with several lenses and rebate up to $50. Check the all out here at B&H Photo (with an extra 2% rewards) and here at Adorama.