Monoprice is having a 12th anniversary celebration and as part of the festivities they are offering 12% off in various product categories with coupon. Good until Thursday night (6/17/14), you can get 12% off the current prices in Camera and Video when you enter coupon code 2MP12 over there. Page down to see the Camera and Video listings, they are below the Pro Audio. Ziggy must first play guitar before a photographer can take pictures of him ;-)
Then on Friday and Saturday, use coupon code 3MP12 for $12 off a purchase of $50 or more. Note that this is a fixed amount coupon, unlike the coupon above which is a percentage discount.
Coupon restrictions are at the bottom of that page. Tamron lenses and 3D printers are not eligible. Yes, Monoprice is now carrying Tamron lenses.
Strategery: Monoprice has all sorts of value priced accessories. However, not every single product they have is a bang for the buck workhorse, so do check reviews. Because shipping is almost always extra, it is a good idea to bunch purchases, and add small things (cables, adapters, etc) to a bigger order. In some situations, eg California shipments, they offer a $6 flat overnight delivery for orders under a specific total weight.