Amazon.com has a Sony MDR-NC6 Over-Ear Noise-Canceling Headphones for $29.59 with Free Shipping.

• Noise-canceling on/off switch; headphones work with or without power
• Includes soft carrying case and airplane adapter plug
• Reduces exterior noise by more than 70 percent (10 dB at 300 Hz) so you can hear music against a quieter background

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