Save $25 on Mac Mini, iMac, Mac Pro and MacBook Air at the Missouri S&T Bookstore. Save $50 on MacBook Pro, iPad with Retina display (fourth generation) and iPad Air (fifth generation). The sale is for in-store and for select models only. The store also has limited supply of previous generation MacBook Airs at $150 off. This offer started May 4 and runs through June 7.