Ending today, Groupon offers the Liger Blaze Sweatproof Bluetooth Headphones for $39.99. Coupon code "SURPRISE" cuts it to $35.99. With free shipping, that's $3 under our January mention, a current best by $9, and the lowest total price we've seen. Features include built-in control buttons and mic, passive noise isolation, two sizes of earbuds, up to five hours of playback, and Bluetooth 4.1.