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

这真是卖得太贵了！如果（一百块）我就买。

How about (100￥)?

卖（一百块钱）如何？

I'd buy this if it were cheaper.

再便宜一点我就买。

拐弯抹角地杀：

Lower the price, and I'll consider it.

价钱低一点我才会考虑。

It's a little overpriced.

这标价有点贵。

I like everything about it except the price.

这东西除了价钱之外我都喜欢。

尔虞我诈地杀：

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

我在别家有看过更便宜的。

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

听说别家的这个东西在大减价。

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

多买一点有折扣吗？