I'm new to Nikon, switching after 6 years with Canon. I was familiar with Canon's annual rebate/promotion cycles (June for Dad/Grad, Holiday time, etc.). I'm looking to start with a D610 and 16-35. Are there particular times of year when Nikon does sales/rebates/promos? I will be looking to purchase before leaving on a 3 week backpacking trip in the beginning of August. But, I'll be getting more glass in the future and am always curious as to when the best deals occur?