See link. I called and they said they don't actually have the passes yet but should by next Monday. They are $23.50 and good for unlimited use on the subway and buses. This will be especially useful this year for anyone that flies to the event as it not only gets you to downtown and back to the airport, but the wrestling club hotels are right next to a subway stop that will take you right to the arena. Plus, the social after the finals has been moved to a hotel in the downtown area that is only a couple of blocks from a subway stop.
Metro Pass for St. Louis
Metro Pass for St. Louis