Adorama offers the Able Planet Sound Clarity Over-The-Ear Active Noise-Canceling Headphones in Black/Chrome, model no. NC550BC, or Silver, model no. NC550S, for $49.99 with free shipping. That's tied with our mention from May and the lowest total price we could find by $34. (Most stores charge $150 or more.) They feature active noise cancellation via two AAA batteries (included), LINX audio technology with remote and microphone, airplane adapter, and 20Hz to 20kHz frequency response.
What are you doing for fun that you could also do for money? Here are some ideas to get you thinking, and tips to get you started.