As one of its daily deals, Newegg offers the Sony ZX Series Noise-Canceling Headphones, model no. MDR-ZX110NC, for $19.99 with free shipping. That's a buck under our October mention and the lowest total price we've seen. (It's the best price we could find now by $15 and a great deal on brand-name noise-canceling headphones in general.) They feature a battery life of up to 80 hours on a single AAA (included). Deal ends today.
These freebies are available to anyone with an internet connection, including both Amazon Prime members and nonmembers.