Foot Locker offers Six Pairs of Nike Men's or Women's Socks in Black or White in 25 different styles for $19.99 with free shipping. (Add two 3-packs to your cart to get this price.) That's $3.33/pair, tied with our September mention, and the lowest total price we could find for most of these socks by at least $4. They're available in sizes M to XL, although not in every color/size combination. (While additional color combination choices may appear on the product pages, the discount applies only to the colors black and white.)
Eastbay offers three pairs of Nike Men's Elite Basketball Crew Socks in 47 styles (Grey Heather/Fusion Red/Distance Blue pictured) for $33 with free shipping. (Add three pairs to your cart to get this deal.) That's the lowest total price we could find for this quantity by $7, although we saw them a week ago for $3 less. They're available in sizes S to XL, although not in all size/color combinations.