From Apple’s current rebates page:
Receive a pair of Beats Solo2 On-Ear Headphones at no cost — or upgrade to a pair of Beats Solo2 Wireless Headphones for $100 — when you buy an eligible Mac with education pricing. Offer starts on July 23, 2015, in Apple Retail Stores and participating Apple Authorized Campus Stores, and on August 6, 2015, on the Apple Online Store and at 1-800-MY-APPLE. Offer ends on September 18, 2015.
I’ve never tried Beats headphones, but I’ve heard that they’re fine. However, this seems like the perfect promotion for back to school. Just as the iPod was the music player all the “cool kids” used back when it was the promo item, Beats are now the headphones.