Mindkoo Electrons via Amazon offers its Mindkoo Bluetooth Speaker in Green for $25.99. Coupon code "D5RBG46M" cuts it to $15.59. With free shipping, that's the lowest price we could find by a buck. It features two LED lights, six hours of playtime per charge, an audio cable input, and 90Hz to 20kHz frequency response. Deal ends December 15.