9. We don't give discounts.
本店概不还价。
还能这样说：
We don't have any discount.
No more discounts are allowed.

10. You get what you pay for.
便宜没好货。
还能这样说：
It's too cheap to be good.
The higher the price is, the better the quality of the merchandise is.
谚语：
In for a penny, in for a pound.
一不做二不休。

11. All of these shirts are half off.
这些衬衫都半价出售。
还能这样说：
All of these shirts are sold at half price.
All of these shirts are on sale for half price.
谚语：
The half is more than the whole.
稳稳到手的一半胜似毫无把握的全部。

12. Take it or leave it.
不满意就算了。
还能这样说：
Accept it or reject it.
Be satisfied with it or get nothing.