Staples offers the Able Planet SH190 Travelers' Choice Headphones in four colors for $9.99. Plus, Staples Rewards members bag free shipping. (Not a member? It's free to join.) That's tied with our per-unit price from two weeks ago and the lowest total price we've seen. (It's also a current low by $5.) They feature a 20Hz to 20kHz frequency response, detachable cable, in-line volume control and microphone, and foldable design with carrying pouch. Deal ends May 2.