B&H Photo-Video again offers the Sennheiser adidas OCX 685i Sport In-Ear Headphones in White for $19.99 with free shipping. That's tied with our expired mention from three days ago as the lowest total price we've seen. (It's also a current low by $10, outside the price below.) They feature a frequency response of 18Hz to 20kHz, in-line smart remote and microphone, and 3.9-foot cable.
A close price: Adorama via Amazon offers them for $21.99 with free shipping.