Polk via eBay offers the factory-refurbished Polk Audio UltraFit 500 Mid-Flange Earphones in Black, model no. ZM1100-A, for $9.99 with free shipping. That's $19 under the lowest total price we could find for a new pair and the best price we've seen for these headphones. They feature tangle-free cables (in three switchable lengths), reflective safety wrap, and moisture-wicking materials. A 6-month Polk warranty is included.