Believe it or not, summer break is winding down and it’s almost time to head back to school. It’s sad, I know, but look at the bright side: retailers like Amazon are using the occasion as an excuse to launch yet another sale. We’re not complaining, mainly because the deals encompass a wide range of solid dorm essentials, some of which include a few of our top picks from our back-to-school shopping guide. For example, our favorite laptop — the latest MacBook Air — recently dropped…