Most cruise lines will sell a soda card. If you or your family drinks a lot of soda, it might be worth the purchase. I believe the cost for a soda card on Royal Caribbean was around $42.00.
Mary Lou Scanlon
NCL Pride of America April 24, 2010
NCL Epic February 12, 2011
RCCL Allure of the Seas - September 18, 2011
Celebrity Eclipse - February 11, 2012:
RCCL Navigator OTS - February 9, 2013