NPD BookScanNPD BookScan licenses access to individual users, not institutions like libraries. Iwasaki Library does not have access to this resource. Helpful statistics on book sales and consumers by point-of-purchase can also be found in Statista and Gfk MRI Mediamark University Reporter, respectively.
What is it? "NPD BookScan™ is the gold standard in POS tracking for the publishing market. It covers approximately 85 percent of trade print books sold in the U.S., through direct reporting from all major retailers, including Amazon, Barnes & Noble, Walmart, Target, independent bookstores, and many others. Data is available to subscribing publishers and contributing retailers, just four days after the period ends, via the NPD BookScan dashboard." - description NPD website