National Geographic Complete Photography (paperback) for $6
The Barnes & Nbole website is having their year-end bargain clearance and among the bargain books we spotted the paperback version of National Geographic Complete Photography offered for $6. Shipping is free if you are a Barnes and Noble member (membership is $25/year) or if the total of your order is $25+.
As of the time of writing, there are 121 bargain books in the Art, Architecture & Photography category. There's no option to isolate the Photography books in this section.
Note: if you select Store Pickup with Barnes and Noble, you have to pay the in-store price which is typically higher than their website price.