I have 2 passes to get admission into the United Club lounges, expiring 12/31/15 (this year). The list of lounges is available (make sure you check that it's club, and not something like first class lounge):
https://www.united.com/web/en-US/content/travel/airport/lounge/locations/default.aspx

1 for $25 or 2 for $45.The retail price is $50 each. Pickup on Stanford campus.