ZipString Luma $30

This popular ZipString Luma drops from $39.99 to $29.99 at Amazon. This viral toy has an air-powered, floating glow-in-the-dark string that you can use to perform over 100 tricks. Shipping is free with Prime or when you spend $35. Otherwise, it adds $6.99. Editor's note: I've had my eye on this since summer, and it rarely drops in price like this. My kids have had this on their Christmas list for months! Check out the product videos to see it in motion.