This is pretty much the only reason I've ever wanted a pair.
Groupon
had a deal on a pair of AblePlanet noise canceling headphones for $69 that ultimately sold out. They were a little unclear about what model they were providing, but based on the specs page they linked, it's a pair that lists at $300 and sells frequently online for around $100-140. I found a review of that specific pair at C|Net and
they thought it was actually not bad. They actually have some lower priced ones that are in the $70 range online without the Groupon, but I don't know if those are as good....