Anyone who has an iPod or any other MP3 players lusts after noise-canceling headphones. The trouble is that they are very expensive. The top of the line in-ear headphones from Shure cost a whopping $500, more than the most expensive iPod. Thankfully, this technology is becoming more and more affordable. The Clear Harmony NC200 noise-canceling headphones from Able Planet are foldable, which is always nice when you want to tuck them away. They feature LINX AUDIO which accomplishes all of the noise-canceling with a frequency response of 20-20,000 Hz. It has a sensitivity of 1 Hz. A single AAA battery will power these headphones. The Clear Harmony NC200 headphones are available from Amazon for just $99.