This Education Dive article mentions that a Barnes and Noble Education partnership with McGraw-Hill might help drive OER awareness. I'm not sure that the author isn't just conflating Open Educational Materials with Inclusive Access. The actual press release makes no mention of OER. It's just an announcement that Barnes and Noble Education will be selling McGraw-Hill products via Inclusive Access programs.
Inclusive access is the questionable practice of charging every student for course materials at the time of registration. Presumably this allows publishers and universities to offer said materials at a lower price, but it also flips the textbook transaction from opt-in to opt-out, which works out very nicely for the publishers.