GearXS offers the Women's Classic High-Top Sneaker Socks 6-Pack for $9.99 with free shipping. That's $15 off list, $1.67 per pair, and the best deal we could find. They fit sock sizes 9 to 11, which roughly translates to shoe sizes 5 to 10. Deal ends May 11.
Note that the socks you'll receive will be random colors.