1.That’s unreasonable! I’d take it for (100¥.)
2. How about (100¥)? 卖（一百块钱）如何？
3.I’d buy this if it were cheaper.
4.Lower the price, and I’ll consider it.
5.It’s a little overpriced.
6.I like everything about it except the price.
7.I’ve seen this cheaper (in) other places.
8.I heard other stores were having great mark-downs on this item.
9.If I buy more than one, will you give me a discount?