They're $5.39/pair from Otaku Mode.
The sushi detail is knitted into the sock with colored thread instead of being printed. Seven versions are available: Masuzushi (trout sushi), Shrimp, Octopus, Red Caviar, Tuna, Salmon, and Egg. These Sushi Socks made in Toyama, Japan make a great gift for fans of Japanese cuisine!
(via Crazy Abalone)