BuyDig via eBay offers the open-box Tamron SP 150-600mm f/5-6.3 Di VC USD Zoom Lens for Nikon, model no. AFA011N700, Canon, model no. AFA011, or Sony, model no. AFA011S700, for $679 with free shipping. That's $21 under our mention of a new, factory-sealed unit from November, the best price we've seen, and the only time we've seen it without a rebate. (It's a current low by $116.) It features 4x ultra-telephoto zoom capabilities, VC image stabilization, three LD glass elements, and an eBAND coating.

Note that while this product is new, the box is dented.