Altec Lansing MZX206W Muzx Core Earphones for $4.99.  Shipping is $5.00 for a total of $9.99 shipped.  Here is a screenshot for your reference.  The earphones feature 10mm Neodymium drivers, noise isolation, 20Hz to 20kHz frequency response, and 16 ohms impedance.  Most places have the earphones for about $16 or more.