Best Buy via eBay offers the Altec Lansing Mini Life Jacket 3 Portable Wireless Bluetooth Speaker in Black, Deep Red, or Aqua Blue, model no. IMW478, for $49.99 with free shipping. That's the lowest total price we could find by $50. This water-resistant speaker floats in water and features a built-in microphone, 3.5mm auxiliary input, and rechargeable Li-ion battery with up to 16 hours of play-time per charge