Woot has the National Geographic Glowing Marble Run – 115 Piece Construction Set with 25 Glow in The Dark Glass Marbles, Storage Bag, Great Creative STEM Toy  for only $11.99 (compare from Amazon)!

• STURDY TIGHT-FIT PIECES – This construction kit is designed to fit together snuggly, so your marble maze won’t fall apart while you play. With 31 exciting action pieces and 53 clear smooth-run tube pieces, and 5 base pieces, our kit has countless imaginative configurations
• GLOW IN THE DARK MARBLES – The marble run kit includes 5 different colors of glow-in-the-dark glass marbles that shine bright as they zig-zag down the marble run. Also includes a UV light to quickly recharge the marbles
• CONVENIENT STORAGE – The included storage bag makes it easy to store your marble run construction pieces and glow-in-the-dark marbles in one place
• GREAT STEM TOY – The learning guide inside teaches about the physics of motion and gravity. It also includes marble run construction experiments
• AWARD-WINNING PRODUCTS – Blue Marble, winner of the Toy Association’s prestigious Toy of the Year Award, proudly develops products that foster education, imagination, and creativity, with a U.S. support team to ensure a stellar experience!

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National Geographic Glowing Marble Run – 115 Piece Construction Set with 25 Glow in The Dark Glass Marbles, Storage Bag, Great Creative STEM Toy