Unique Photo takes $50 off any Sigma camera lens of $200 or more via coupon code "SIGMA50". Even better, all lenses qualify for free shipping. Combined, that beats our March mention for $50 off $250 and puts many models at or near lowest-we've-seen prices.

A best bet is the Sigma 70-300mm F4-5.6 Motorized Lens for Nikon (pictured), model no. 5A8306, for $189 after the above coupon. With free shipping, that's the lowest total price we could find by $10.