Sennheiser CX 485 Noise Blocking Earphone for $19.95 shipped after promo code EMCYTZT1669.  Here is a screenshot for your reference.  The earphone features noise blocking, 19Hz to 20.5kHz frequency response, 120 dB sensitivity, in-line volume control, 3.9-ft cord, and works with all 1/8" (3.5mm) headphone inputs.  Most places have it for about $39.