Sony MDR-NC33 Noise-Canceling Earbud Headphones with Flight Adapter for $19.99 shipped.  Here is a screenshot for your reference.  It features neodynium magnet, 13.5mm driver, noise-canceling design, monitor switch, flight adapter, and more.  Most places have this Sony MDR-NC33 Noise-Canceling Earbud Headphones for about $54 or more.