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？