你想买到便宜又实用的商品吗？先来学学和卖家讨价还价吧。

　　1. Hey, don't try to rip me off. I know what this is worth.

　　别想宰我，我识货。

　　Rip someone off 意为某商店或商贩企图宰它的顾客。买东西最担心被宰，行家都要先造出声势，用这句话镇住卖家。如果真的被狠宰了一下，可以说，"I was ripped off ."或者"I was cleaned out."

　　The shop tried to rip me off, but I taught them a good lesson.

　　那个商店企图宰我，结果让我教训了一顿。

　　2. Can you give me a little deal on this?

　　这能卖得便宜一点吗？

　　Can you give me this for cheaper?

　　能便宜一点给我吗？

　　3. Is there any discount on bulk purchases?

　　我多买些能打折吗？

　　Give me a discount.

　　给我打个折吧。

　　Bulk purchases就是"大量地购买"，等于buy something in bulk.

　　"Discount"是折扣的意思，平时在商店里常出现的表示打折的牌子是on sale. 专门卖廉价物品的商店叫bargain store，店里卖廉价商品的柜台可以叫做bargain counter.