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ThinkGeek offers the LED Unisex Binary Watch (pictured) for $49.99. Apply coupon code "DETENTION" to add a pack of Spitballs for free. With $6.14 for shipping, that's $24 off list and the lowest total price we could find for these items. The watch displays time using binary representation and features a circuitboard face with 10 LEDs, stainless steel case, leather band, water resistance to 66 feet, and more. The spitballs expand up to 200 times when soaked in water and bounce and/or explode on impact.