on sale后面加什么介词

The new stamps are now on sale at main post offices.

新邮票现在各大邮局有售。

And they are not on sale at your local department store.

它们不是你那里百货商店的销售品。

He bought a sports jacket on sale at Gowings Men's Store.

他在高英斯男装店买了一件打折的运动上衣。

Today is Mother's Day and all the jewellery is on sale at Rich's.

今天是母亲节，瑞奇店的所有首饰全部折价出售。