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JBL offers the refurbished JBL Under Armour Sport Wireless Bluetooth In-Ear Headphones in several colors (Black pictured) for $29.99 with free 2-day shipping. That's $20 under our March mention and the lowest price we've seen. (It's the best deal now for a refurb by $30.) They're sweat-proof and feature an inline 3-button mic, 8-hour battery, and 10Hz to 22kHz frequency response.

Note: A 1-year JBL warranty applies.