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You'll probably be able to buy supplemental insurance at an extra cost.

再多付一些钱的话，你或许就能买附加险。

《柯林斯英汉双解大词典》

Your wedding ring can be engraved with a personal inscription at no extra cost.

你的结婚戒指可以刻上个人题字不另收费。

《柯林斯英汉双解大词典》

This extra cost is the insurance premium.

VOA: special.2010.05.11

I think these extra pictures sometimes they're helpful, sometimes they just make the book cost a lot more.

我想这些补充的图片有时是有用的,有时仅仅是把书价抬高了一点

耶鲁公开课 - 基础物理课程节选

At the margin, I'm reaping, I'm bearing the cost for the extra unit of effort I contribute, but I'm only reaping half of the induced profits of the firm, because of profit sharing.

从边际角度分析,我承担了多付出的全部边际成本,但我却只能得到一半的边际收益,因为利润是均分的

耶鲁公开课 - 博弈论课程节选

But Denon's DVD-9000 may have just enough bells and whistles to elicit the extra cost.

FORBES: Magazine Article

The service is available to paying Gold members of Xbox Live for no extra cost.

FORBES: Connect

Hospitals absorb the extra cost or pass it on to other patients, experts say.

WSJ: Study Raises Doubts Over Robotic Surgery