Amazon.com with JandR has an Etymotic ER-4P Portable Earphones for $179.99 with Free Shipping.
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- Noise isolation: 35-42 dB n
- Maximum output: 122 dB SPL n
- Weight: less than 1 oz. n
- Response accuracy: 86% n
- Frequency response: 50-10 kHz ± 2 dB; 20-16 kHz ±4 dB