The guy in the next cubicle at work spends the day shouting into his telephone. This makes it hard for me to get my own job done (writing technical documents). Unfortunately he's a VP so I can't just tell him to get stuffed. I understand that active noise cancellation headphones may solve my problem. These have been marketed by Bose $$$ and The Sharper Image $$$. Does anyone have some suggestions about where to get them cheaper than from these two "worthies"?