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Harman Audio offers the refurbished JBL Go Portable Mini Bluetooth Speaker in several colors [harmanaudio.com] (Black pictured) for $ 19.99 with free shipping. It features Bluetooth 4.1, a rechargeable battery, 3.5mm auxiliary input, USB charging, and speakerphone. Deal ends August 13.

Note: A 1-year Harman Audio warranty applies.