常见的有: negotiate a reduced price, beat sb down, bargain, haggle¹...

beat sb down: to persuade someone to reduce a price 说服某人降价,杀价

He wanted $8 000 for the car but I beat him down to $6 000.

他那辆汽车要价8000元,但我压到了6000元.

Bargain: to discuss the conditions of a sale, agreement etc, for example to try and get a lower price 讨价还价,商讨条件

He said he wasn't prepared to bargain.

他说他不愿讨价还价.

Haggle: to argue when you are trying to agree about the price of something 讲价

通常搭配是: haggle (with sb) (over sth)

I left him in the market haggling² over the price of a shirt.

我扔下他自己在市场上就一件衬衫讨价还价.

Don't you even try to fool me! I'm no country cousin.

你甭想蒙我!我可不是乡巴佬.

You are pricing yourself out of the market!

你这是漫天要价!

It's a daylight robbery!/ You must be putting me on. To charge 50 yuan for a mere³ cup of tea!

简直是抢劫!一杯茶就要我50块.

That's unreasonable⁴! I'd take it for 100.

太贵了!一百块我就买.

I like everything about it except the price.

各方面我都很喜欢,除了价格.

Lower the price and I'll consider.

便宜点我就考虑下.

If I buy more than one, will you give me a discount?

我多买几个,能给我打折吗?

Three hundred dollars for this dictionary - isn't that a bit steep?

这本字典要三百美元,是不是贵了一点?

It's a rip-off.

贵得太离谱了。

I'm afraid I can't drop the price any further.

这是最低价了.

I'm not kidding, but we are making a fair deal—30 yuan is quite acceptable for a decent man like you.

我不是跟你开玩笑.你是个体面人,30块的加钱很合理.

Do be reasonable! My offer is based on a minimum profit.

我这价儿不高,利已经够薄了.

It's the best offer I can make . Take it or leave it.

这是我能出的最低价,不要拉倒.