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ProducTech via eBay offers the Treblab X2 Completely Wireless Bluetooth In-Ear Headphones in Black or White for $49.97 with free shipping. That's the lowest price we could find by $9, although we saw them for $5 less in December. They feature a mic, Bluetooth 4.1, IPX4 water resistance, and 10 hours of playtime on a single charge.