Adventure Time: The Complete Series Boxed Set (DVD) $33 (was $50) See at Amazon This Prime Day you can pick up one of the most influential series of the 2010s for a steep discount: the Adventure Time boxed set for just $33 (down from $50). Pendleton Ward’s fantasy series earned rave reviews during its run and is still a cult classic today thanks to its many spin-offs. If you’ve been looking for an excuse to return to the land of Ooo,…