In 2009, Learning Horizons released a series of Sesame Street flash cards. Each set has over 50 cards. There are 5 packs in all in the series.
Colors, Shapes and Opposites
Beginning Words / ABC / Colors, Shapes and Opposites
ABC / Letter Sounds / Numbers 1-20 / Beginning Words
From 2006 to 2008, Learning Horizons also released a series of bilingual Sesame Street flash cards.