UntilGone offers the Sony Wireless Over-Ear Headphones for $69.99. Coupon code "SONYOVER" drops it to $59.99. With free shipping, that's tied with last month's mention and is the lowest price we could find by $10. They feature noise reduction, on-board volume control, and up to 25 hours of playback per charge.
Making even one of these mistakes can easily cost you tens of thousands of dollars.