Welcome to CHEAP, our series about things that are good, but most of all, cheap. CHEAP! I love headphones. I also love noise-canceling headphones. And, in particular, I love Sennheiser noise-canceling headphones. But, most of all, I love a big fat discount on a pair of the Sennheiser PXC 550 noise-canceling headphones. You read that right, currently you can get 34 percent (specifically, $119.98) off a pair of the cans. That means you can get your very own set of Sennheiser PXC 550 for only $229.97. Victory! So, what sweet features do the Sennheiser PXC 550 headphones have? First off, they’re wireless. Using…

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