Xiaoyu is haggling over a cup in a small shop. Chen Hao wants one too, which brings the price down.
Xiaoyu
老板，这个杯子多少钱？
Lǎobǎn, zhè gè bēizi duōshao qián ?
Excuse me, how much is this cup?
The shopkeeper
三十五。那个大的四十。
Sānshí wǔ. Nà gè dà de sìshí.
Thirty-five. The big one next to it is forty.
Xiaoyu
有点儿贵。便宜一点儿吧。
Yǒudiǎnr guì. Piányi yīdiǎnr ba.
That is a bit steep. Make it a little cheaper.
The shopkeeper
三十，不能再少了。
Sānshí, bù néng zài shǎo le.
Thirty, I cannot go any lower.
Chen Hao
我也要一个。两个多少钱？
Wǒ yě yào yī gè. Liǎng gè duōshao qián ?
I want one too. How much for the two?
The shopkeeper
两个五十五。
Liǎng gè wǔshí wǔ.
Fifty-five for the two.
Xiaoyu
好，就要这两个。
Hǎo, jiù yào zhè liǎng gè.
Good, we will take these two.
The shopkeeper
一共五十五块。
Yīgòng wǔshí wǔ kuài.
Fifty-five yuan altogether.
Chen Hao
给您。谢谢老板！
Gěi nín. Xièxie lǎobǎn !
Here you are. Thank you!
The shopkeeper
慢走。
Màn zǒu.
Mind how you go.
Both translate as "a little" and they do not go in the same place. 有点儿贵 comes before the adjective and expresses discomfort: it is a bit expensive, and that bothers me. 便宜一点儿 follows it and asks for a change: make it a little cheaper. You do not say 一点儿贵, and 有点儿便宜 would mean that a price this low worries you.
便宜一点儿吧 is the full formula: the verb, the amount, and 吧 which turns an order into a suggestion. You do not name a figure first. The shopkeeper answers 不能再少了, "I cannot go any lower", which is a polite refusal and often negotiable once, but not twice.
慢走 literally means "walk slowly" and is said to the person leaving: a shopkeeper to a customer, a host to a guest. It is not returned: the one leaving answers 再见, or nothing at all. It has a cousin at table, 慢吃, and one in the street, 慢点儿.
