MacMall offers the refurbished Sony MDR-NC60 Noise-Canceling Headphones for $74.99 with free shipping. That's $5 under our March mention and the lowest total price we could find for a refurb by $28. These over-the-ear headphones feature up to 85% ambient noise reduction, 14Hz to 22kHz frequency response, foldable design, and up to 30 hours of playback time via one AAA alkaline battery (included).

A 90-day warranty applies, although it is unclear who backs it.