1.That's unreasonable! I'd take it for (100¥.)

   這真是賣得太貴了！如果（一百塊）我就買。

 2. How about (100¥)?     賣（一百塊錢）如何？

 3.I'd buy this if it were cheaper. 

     再便宜一點我就買。

 4.Lower the price, and I'll consider it. 

    價錢低一點我才會考慮。

5.It's a little overpriced. 

   這標價有點貴。

6.I like everything about it except the price. 

  這東西除了價錢之外我都喜歡。

7.I've seen this cheaper (in) other places. 

  我在別家有看過更便宜的。

8.I heard other stores were having great mark-downs on this item. 

  聽說別家的這個東西在大減價。

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

  多買一點有折扣嗎？