Do you have the AmEx Costco credit card? Earn a $10 Costco Cash Card when you Pay Your Wireless Phone Plan
with your American Express Costco Card.
From the website:
Enroll now and you can earn a $10 Costco Cash Card when you use your American Express Costco Card to automatically pay your wireless phone plan. To be eligible for this offer you must also contact your wireless service provider and request to use your American Express Costco Card to automatically pay your monthly phone bill. Offer good from now until January 15th, 2008.