I have a $40 United Airline electronic certificate that can be used as CASH to purchase any Unite Airline tickets. I got this from united after their flight was delayed. The certificate expires on 1/1/2017.

Here's the instruction to redeem the certificate, under Certificates/discount codes for travel certificates, with promotion code "TCVA":
https://www.united.com/web/en-US/content/booking/flight/offerCode.aspx

Asking $15 OBO. I'd be happy to give you the certificate before you pay me. But please email me with your Stanford email so I know who you are.

Happy traveling.