I bought this used car for a song.
我买的这辆二手车物超所值。
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buy something for a song含义是花的代价不大,而买到东西却很合算。这个短语可能来自街头卖唱的艺人。他们做的是无本买卖,唱歌来换取生活所需。如果唱一支歌就能得到报酬,也就是没花钱而买到了,言下之意是非常便宜,等于中文里那句“物超所值”。
例句:
You have to be careful when you buy a used car. But I bought this 91Ford for a song, about half of what I expected to pay. And I've had good luck with it - it runs like a new car.
买旧车是得小心谨慎,但我买的这辆91年福特牌汽车真是物超所值,只花了预计中的一半钱。可我真走运,这车开起来就像新的一样。