I got an email from Rakuten Global Market early yesterday morning regarding an upcoming period where they will be offering free overseas shipping on qualifying orders. I don't think this is a tie-in to the Eagles winning the Nippon Series on Sunday as they did this six months ago also.
If you spend at least 10000 yen (roughly $100) from one of the participating stores, Rakuten will pay the first 3000 yen ($30) of your shipping charge. Considering that reader Pete just got three boxes of cards from Niki (which is a participating store) via Rakuten and paid $24 for shipping, you can probably get a number of items with free shipping.
You will need to place your order between 1000 JST on November 12 to 0959 JST on November 15 (which corresponds to 8 PM Eastern Standard Time on November 11 to 7:59 PM Eastern Standard Time on November 14). You can pre-order items but your order must ship by the end of the year (Japanese time) to qualify for the free shipping.