Groupon has the JLab Crasher portable Bluetooth speaker for just $40 with free shipping, 46% below Amazon and 60% under the retail price of $100. Features include Bluetooth connectivity with up to a 30ft range, speakerphone functionality, and an average battery life of up to 18 hours. The anodized exterior provides provides a sleek finish while remaining rugged enough to protect from some bumps and drops. Perfect for long days tailgating or camping, the JLab Crasher even has a USB port to charge mobiles devices. Several color combinations to chose from.