StackSocial offers a School of Game Design Lifetime Membership for $59. Coupon code "GAMER20OFF" cuts that to $47.20. That's $22 under our June mention, $5,943 off list, and the lowest price we could find. (For further comparison, a 12-month membership costs $599.) It features 120 hours of video training and royalty-free art and textures. Deal ends April 15.