We paid an arm and a leg for it.

我们花了一大笔钱买的。

He is a legend you know, I don't mind paying an arm and a leg to see him.

你知道，他可是个传奇人物。只要能看到他，贵一点我也不介意。

Sometimes they pay an arm and a leg for something.

有时他们会为某些东西支付一条胳膊和一条腿。

And you can get one without paying an arm and a leg.

而且您无需花大价钱就可以得到一个。