3 sentences

1. 这些商品正在减价出售。

   zhè​xiē shāng​pǐn zhèng​zài jiǎn​jià chū​shòu.

   These items are on sale.

   Source: Dong Chinese Dictionary

2. 这家超市正在搞减价促销活动。

   zhè jiā chāo​shì zhèng​zài gǎo jiǎn​jià cù​xiāo huó​dòng.

   This supermarket is having a price-reduction sale.

   Source: Dong Chinese Dictionary

3. 封面缺损的书籍通常会被减价出售。

   fēng​miàn quē​sǔn de shū​jí tōng​cháng huì bèi jiǎn​jià chū​shòu.

   Books with damaged covers are usually sold at a discount.

   Source: Dong Chinese Dictionary