The 12-month prepay: instant $25 off, a free-panda box ($25 value), Private 20% off code for the Panda Shop and unlimited free-shipping across your subscription period.
Renews monthly
Renews semi-annually
Renews annually: Buy 12 with 11 (Price includes a free box) & Get a $20 Gift Card after you subscribe
Past boxes have included books like these: