GearXS offers this Girls' No-Show Emoji Socks 6-Pack for $4.99 with free shipping. With free shipping, that's the lowest total price we could find by $2, although we saw them for a buck less three weeks ago. They're available in size 6-8.
Note that Women's are available for $5.99. That's the lowest total price we could find by $1, although they were $1 less three weeks ago. They fit sizes 9-11. Styles appear to be chosen at random. Deals end June 3.