Hmm...like most TMNT merch, socks aren't likely to have a huge online presence other than eBay because they have such a wide product availability in brick and mortar stores. I found these but shipping is probably a pretty penny:
http://cgi.ebay.com/3-PAIRS-OF-BOYS-...QQcmdZViewItem
Your best bet is to check department stores like JC Penney and superstores like Target or Walmart...good luck
