Get the Harman Kardon Onyx Mini Portable Bluetooth Speaker for $69.99 with free shipping at Groupon Goods. This was the lowest price we found by $10. The speaker streams audio from other Bluetooth devices, such as laptops, tablets, and smartphones. It has a built-in mic for use as a speakerphone when paired with a smartphone. It runs on a rechargeable battery with up to 10 hours of playback time. Sales tax is charged in most states.