2 sentences

1. 这种热门手机往往需要加价才能买到。

   zhè zhǒng rè​mén shǒu​jī wǎng​wǎng xū​yào jiā​jià cái néng mǎi​dào.

   These popular phones often require a price markup to purchase.

   Source: Dong Chinese Dictionary

2. 他低价买进那批紧缺的零件，再加价倒出去，赚了一笔。

   tā dī​jià mǎi​jìn nà pī jǐn​quē de líng​jiàn, zài jiā​jià dǎo chū​qù, zhuàn le yī bǐ.

   He bought that batch of scarce parts at a low price and resold them at a higher price, making a tidy profit.

   Source: Dong Chinese Dictionary