bargain（與某人就某事）討價還價，商討條件
He said he wasn't prepared to bargain.
他說他不愿討價還價。

haggle over（尤指）講價
My mom was haggling over the price of a shirt.
我媽為一件襯衫在討價還價呢。
I hate having to haggle over prices.
我不喜歡討價還價。

I am on a tight budget so I am looking for your best price.
我預算緊張，所以我要你給個最低價。
I don't have a lot of wriggle room.
我的預算沒有太多活動空間。
How far can you come down in price to meet me?
你的價格還能降多少？

Is there any discount?
有折扣嗎？
Can I get a discount?
能打折嗎？
Can you lower the price?
價格你低一點嗎？
Can you make it lower?
你能降點價嗎？
Is that the best you can do?
這是你的最大折扣嗎？
How much is this and this altogether?
這兩個一起多少錢？