MassDrop offers the Etymotic Research ER4-S MicroPro Earphones for $219.99 plus $5.37 for shipping. That's the lowest total price we could find by $74. They feature balanced armature drivers, up to 42dB of attenuation, user-replaceable filters, and 20Hz to 16kHz frequency response range. Deal ends July 24.

The expected shipping date is July 31.