You can order cards that display your promo code at this link:
We are very glad you’re interested in growing your referral network. It's extremely important that you never place your materials at or on a gas station without express permission from the gas station. We rely on strong relationships with our merchant partners to keep GetUpside growing, and cannot risk any harm to those relationships.
In that vein, please do not tape, adhere, or otherwise place your referral materials at/on a gas station or business without permission. Failure to comply with this request may result in the termination of your GetUpside account.