According to The Green Bag website (www.greenbag.org):

“Supreme Court Sluggers” cards are creations of the Green Bag. They are supposed to be useful and entertaining. Useful by presenting interesting information about the work of the Supreme Court of the United States. Entertaining by providing small, amusing-but-respectful links between the world of law and the world of sport.

We make Sluggers cards for the joy of it, and then we give them away. We do not sell them. If you get one, we hope you enjoy having it as much as we enjoyed making it. We make no promises about when we will make them or who will get them. Indeed, we are avowedly and aggressively arbitrary and capricious about distribution. So, there is no way to lock-in a Slugger. If you want to buy one, your best bets are law school public interest charity auctions and eBay.

Many of the paintings by John Sargent and Alec Spangler that are featured on the front of every Sluggers card are in the collection of the Supreme Court of the United States.