As of June 2015, The National Mah Jongg League store, Amazon.com and The Mah Jongg Maven sell National Mah Jongg League cards online. The National Mah Jongg League store has individual cards in standard, small and large sizes.
Amazon.com offers both individual cards and packs of cards. Standard and large sizes are available. The site shows users ratings and reviews for some products. The Mah Jongg Maven carries both standard and large-print cards.
Mah Jongg players met in New York City in 1937 to standardize the rules of the game. This group founded The National Mah Jongg League. The League modifies rules on a yearly basis.