In this May 24, 2011 photo, customers line-up to purchase gasoline at a Costco station in Redwood City, Calif. Costco Wholesale Corp.'s revenue at stores open at least a year climbed 13 percent in ... more 
In this May 24, 2011 photo, customers line-up to purchase gasoline at a Costco station in Redwood City, Calif. Costco Wholesale Corp.'s revenue at stores open at least a year climbed 13 percent in May, surpassing Wall Street's expectations. less 
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Associated Press | Photo By Paul Sakuma
Thu, Jun 2, 2011 7:17 AM EDT