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They have flashcards of all of the letters and numbers at the IBC bookstores. However, the flashcards are for Cambodian kids so they don't have English on the back, they have pictures of animals that start with the same letter, so if you don't know the Khmer words for a billion animals, it doesn't help much. You can write your own "hints" on the other side, though. I found it easier to just get index cards and make my own.