Sigma has started a new instant rebate program in the United States. Save up to $200 on select lenses until September 25, 2013.
Tamron is running instant rebates until September 30, 2013. Included in their program is the highly regarded 24-70 f/2.8 VC
Canon's lens and Speedlite rebates are set to expire on July 6, 2013. B&H Photo is telling us that the rebate program is not being extended. There's a chance a new program will launch shortly after this one, but there's no guarantees of that for the moment.