It looks like the parents of kids at the Brown School sell them here and there. They have a Yahoo Group - from the messages I read, it doesn't sound like there are any other fixed retail locations, but perhaps you could contact someone from the group to arrange a pickup.
Here are a couple of recent messages that discuss the cards: Message 315 (http://groups.yahoo.com/group/BrownSchoolFamilies/message/315), Message 316 (scroll down) (http://groups.yahoo.com/group/BrownSchoolFamilies/message/316)
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Date: 2009-08-30 12:28 am (UTC)Here are a couple of recent messages that discuss the cards: Message 315 (http://groups.yahoo.com/group/BrownSchoolFamilies/message/315), Message 316 (scroll down) (http://groups.yahoo.com/group/BrownSchoolFamilies/message/316)