To celebrate Valentine’s Day, Barnes & Noble has released a 15% off coupon. You can either print it here and use it in-store or shop online with code 4A1SKJ9M1CYY7. The coupons expire Feb. 18 and are not valid on Nooks or Nook books. I was pretty bummed about that because, since I have a Nook, I don’t buy “real” books anymore. But, with 15% off, I may have to make an exception!