Ebay offers adidas men Athletic Cushioned Crew Socks 6 Pairs for $9 (reg. $20) with free shipping. 

Product Description: 
Stop searching for the lost match to your favorite socks. With six pairs of matching socks, you'll always have a set. These adidas crew socks support your feet with foot-hugging arch support. The stretch blend pulls moisture away from the skin to keep feet feeling dry.