Groupon offers the BassBoomz 2.0 Portable Bluetooth Speaker in eight colors (Gold pictured) for $29.99 with free shipping. That's $100 off and the lowest total price we could find. It features a rechargeable lithium-ion battery, 3.5mm plug, and up to six hours of play time per charge. Deal ends December 23.
Note: It's not guaranteed for delivery by Christmas.