He bought that car at a rock-bottom price.

他以最低价格买到了那辆车。

That’s definitely my rock bottom price.

这绝对是最低价格了。

This is our rock-bottom price, Mr Li. We can't make any further concessions.

李先生，这是我方的最低价格，不可能再让了。

Let's meet each other half way. I'll drop another 5%. That's definitely my rock bottom price.

我们来折中一下吧。我再降5％。这绝对是最低价格了。

Can you tell me the rock-bottom price of this product?

我能问一下这种产品的价格吗？

If you want to buy that stuff, it is the time because they are selling for rock-bottom price now.

如果你想买那东西，现在正是时机，因为他们正在贱价出售。