It’s certainly not going to knock any socks off this year, but Apple has finally kicked off its annual back to school sale. A day behind schedule, Apple on Thursday announced that students making qualifying Mac purchases will receive a complimentary $100 iTunes gift card. The offer applies to college students and those accepted into college, and any MacBook, MacBook Pro, MacBook Air, iMac or Mac Pro purchase will qualify for the gift card. Apple’s promotion this year offers less than half the back-for-your-buck compared to past promotions that offered a free iPod touch with each purchase, but $100 toward software for your new Mac computer on top of a 10% student discount still makes for a decent deal. Apple’s offer runs from now through September 20th, so students have more than enough time to wait for that imminent MacBook Air refresh we’ve all been expecting.