Maia Weinstock, who is a Deputy Editor at MIT News, created the custom set, called it the Legal Justice League, and uploaded a set of photos to Flickr.
The set includes the three women currently sitting on the court - Ruth Bader Ginsburg, Sonia Sotomayor, and Elena Kagan - as well as the Court's first woman, Sandra Day O'Connor, who retired in 2006.
On her website, Weinstock writes:
Celebrate women in
This set of custom-designed LEGO minifigures, U.S. Supreme Court replica, and SCOTUS library/study aims to celebrate the accomplishments of women in the legal realm, and to encourage girls and women to work toward high positions in the U.S. judicial system. See additional photos on Maia's Flickr album.
It appears that this is a custom set that is not available for purchase, but we've reached out to Weinstock just to make sure.
Here are the best LJL Lego images: