With my Costco executive membership and store card, I earn enough rewards to pay for a whole shopping trip — here's how

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• I have a Costco executive membership and a store credit card, so I stack rebates and rewards.
• In addition to bulk deals, my membership gives my family a 2% rebate on most Costco purchases. 
• The credit card earns me an additional 2% cash back on purchases plus 4% cash back on Costco gas.

For the first time in seven years, Costco said it will raise its membership prices. On September 1, the $60 gold-star...