Audio Technica ATH-ANC9 ANC for $180

The Audio Technica ATH-ANC9 active noise cancelling headphones go for $200 at most dealers, but for the next seven days you can get them for $180 with free shipping and free returns and a 1-year Audio Technica warranty through Groupon Goods.

These are powered by a single AAA battery, so you have the usual philosophical battery trade-offs. They average 4 out of 5 based on over 280 customer reviews at amazon.com.

PS: these should not be confused with the previously mentioned ATH-ANC7b which go for under $90.