Or use a card that gives cash back reward or frequent flyer miles, and you'll make a nice little bonus for yourself.

或者使用有现金回赠的或有连续飞行公里数回赠的消费卡，这样你就可以为自已赚点额外的奖金了。

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Consumers "see this as a real convenient way to redeem their cash-back bonus, " says Dana Traci, vice president of rewards at Discover, which introduced its Amazon offering last October.

WSJ: The New Credit-Card Rewards Programs

You can go for those bonus miles and cash-back cards, but not all at the same time.

WSJ: Getting Going: The New Credit-Card Rules