As one of its daily deals, That Daily Deal offers the Fila Men's or Women's Performance No-Show Socks 12-Pack for $12.49 with free shipping. That's $1.04 per pair and tied with our mention from last July as the lowest price we've seen. (It's the best deal now by $7.) They're available in men's sizes 10-13 (shoe sizes 6 to 12.5) or women's sizes 9-11 (shoe sizes 4 to 10).
Note: Colors are chosen at random.