For Wednesday August 28 in 2013, at Staples brick and mortar stores, they have a coupon flash sale: save 15% off on the purchase of various technology items, including digital cameras. The discount is on the current prices of the various products. Camera selection varies from store to store, but they typically don't carry advanced or professional gear. They may have a couple of DSLR/iLC models in-store but don't expect a B&H showroom lineup :)
I don't know if you can use the coupon to order more advanced cameras through the store kiosk or a store employee via their online ordering system. This is probably a YMMV depending on how the system is setup and perhaps on the local store's manager discretion? The promotion is only good at brick and mortar, not at their website. It ends at the close of business on Wednesday 8/28/13.