If you're seeking a fun and affordable stocking stuffer this holiday season, it's hard to pass up Shashibo Magnetic Puzzle Cube. They're something between a fidget cube and a Rubik's Cube. The shape-shifting puzzle cube is wildly popular, and comes in dozens of designs based on pop culture properties like Avatar: The Last Airbender, Teenage Mutant Ninja Turtles, SpongeBob, and more. Even better, many models are on sale at Amazon, with some as much as 30% off.