Big Deals via eBay offers the open-box Plantronics Backbeat Go 3 Wireless Bluetooth Earbuds with Charging Case in Granite Black for $14.99 with free shipping. That's the lowest price we've seen and $15 under the best deal we could find for a refurb elsewhere. These sweat-proof earbuds feature 6mm drivers, a 20Hz to 20kHz frequency response, and up to 6.5 hours of playback per charge. Note: No warranty information is provided, but the vendor does offer a 30-day return policy.