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？