Groupon offers the Monster Beats by Dr. Dre Pro Headphones in Black, model no. 900-00034-01, for $299.99 with free shipping. That's the lowest total price we could find by $40, although we saw them bundled with $23 store credit for $70 less during Cyber Monday week. They feature padded, pivoting ear cups, noise cancelling, and 6-foot cable. Deal ends June 21.