Amazon.com has a Philips HN 110 Folding Noise Canceling Headphones with In-line Volume Control for $19.97 with Free Shipping on orders over $25.
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- Closed-style, dynamic headphone with 40mm driver n
- Neodymium magnet and CCAW voice coils n
- Frequency Response: 20Hz–20kHz n
- Ideal for airplane, train and bus use n
- Noise canceling feature reduces background nose in any environment