Pre-order Series 3, and get them as SOON as they come out. Pre-release date says "MARCH" but EE.com sent out Battle Cases early, so hopefully these follow suit.
Single Booster $9.99
Other online stores list the release date in "FEBRUARY". My guess is that January is still the release date. Large suppliers will get them first (retails like Wal*Mart and Target) and smaller online stores may not get them until end of January or earlier February. So, March may be a "Promise Late, Delivery Early" strategy.
All I know for sure is that once they are in stores, you will find out here!