If you don't find any coupons and you have a Windows Live ID you can always go to
Live Search and click the cashback link at the top right of the page. Search for one of the items you're planning on buying, click through to the item description and click on the B&H Photo link in the price comparison and click Go To store. You'll get 2% of your purchase in your Cashback account.
Note: I am a MSFT employee so take the advice with the precaution that I'm encouraging you to use my company's service.