Groupon offers the Liger Blaze Sweatproof Bluetooth Headphones in Black for $34.99 with free shipping. That's a buck under our mention from two weeks ago and the best price we've seen. (It's a current low by $10.) Features include built-in control buttons and mic, frequency response of 20Hz to 22kHz, passive noise isolation, two sizes of earbuds, up to five hours of playback, and Bluetooth 4.1. Deal ends May 8.