Do you have this in blue?
你们这件有蓝色的吗?
That comes in green,blue and red.
那件有绿色,蓝色和红色。
How much is it?
这件多少钱?
How much does this cost?
这件多少钱?
It's on sale at the moment.
现在正在打折。
Do you have a size 8?
你们有八号的吗?
Do you have it in smaller sizes?
你们有小一点的吗?
We're having a sale at the moment.
我们正在特卖中。