$15 OFF Coupon Code $15 Off Seagate Backup Plus For Mac, Now $114.99 + Free Shipping Get Coupon Code AFNJ2399 Use the code to save $15 on the Seagate Backup Plus for Mac 3TB 3.5" USB 3.0 Mac Storage - Desktop Model STCB3000900, now $114.99. Free Shipping included.