Woot offers SuperEye MD6100 Metal Detector with Waterproof 6-Inch Coil and LED Flashlight, Adjustable Stem 28-36-inches, Black for $41.99 (orig. $99.99) + free shipping with Prime.

Product Description:

TREASURE IS EVERYWHERE! With over 15 years of experience, SuperEye dedicated to providing amazing metal detecting tools with affordable prices and excellent service. 

• Adjustable Metal Detector: 6KHZ operating frequency, valve stem adjustment range is 28" - 36", suitable for all children and adults without having to worry about height. Give you the opportunity to hunt treasures with your boys and girls
• Waterproof Search Coil: great waterproof ability on coil makes our products very easy to use in any season and weather. In lawns, parks, beaches and other outdoor places, our high-sensitivity metal detector with 6.5-inch coil can make your treasure adventure easy
• Unique Design & Lightweight: this metal detector has a patent for appearance and utility model, and has a unique design. Easy to install, 1.85 pounds are very lightweight and small, making it easy for children to grasp and move. Easy to find treasures, such as coins, iron, silver, jewelry, artifacts, etc.
• LED Indicators: red, green and blue visual expressions and voice prompts help you discover and understand the treasure you are looking for, easy to operate. The metal detector has 2 operation modes to choose from. Adjustable sensitivity (4.7" - 6"), precise positioning function can help you accurately detect the metal you need
• Perfect Kid's Gift: the unique metal detector will be the perfect gift for children on birthday or children's day. Harmless and healthy materials are safe for your child. Develop their brains, and activate their bodies.