在商务英语中，还价是一个重要的技能，以下是一些有效的表达方式和策略：

询问订单量

How large is the order you intend to place with us？

提出具体折扣

20000 sets with a discount rate of 10%.

表达不能接受的价格

I'm afraid I couldn't agree with you for such a big discount.

拒绝过低的价格

I don’t think we can go that low.

I’m afraid we cannot make it that low.

提出条件性的折扣

If you buy more stock, we can give you a bigger discount.

同意对方的还价并作出调整

I'll respond to your counter-offer by reducing our price by three dollars.

表达无法满足对方要求

It's absolutely out of the question for us to reduce our price to your level.

强调产品质量和服务

We provide outstanding product/service. Our company values quality very much.