You can buy directly from the Korean store for amazing prices. You are supposed to be a store, but they don't check the information so it's easy to set up an account. There is a $100 minimum and the shipping usually runs about $50, but what I've done is split an order with a friend.
http://e-puppyzzang.com/index.php
This is the website for their US distributor. The price works outs to be about the same if you figure in the shipping, but their selection isn't as big.
http://www.puppyinstyle.com/