Apple has announced its Back to School 2015 Promotion, later than usual this year and notably excluding any iOS devices or iPod-related offers. Between July 23 and September 18, educational customers purchasing an iMac, MacBook, MacBook Pro, MacBook Air, or Mac Pro can also elect to receive a $199.95 credit to be applied to a pair of Beats Solo2 On-Ear Headphones or Beats Solo2 Wireless On-Ear Headphones purchased at the same time. The same promotion…