二者都可以，例如：

1. I wouldn't work for her again ─ not at any price!我再也不替她做事了，給多少錢也不做！2.Many items are at half price.許多商品都以半價出售。

3.Oil increased in price.石油價格上漲了。4.It's amazing how much computers have come down in price over the past few years.過去這幾年，電腦的價格大大降低，簡直令人驚訝。