How about buy one and get one free?

买买一送一怎么样？

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For example, the next time you purchase shower gel where you buy one and get one free, keep one for yourself and set the other one aside for future gift giving.

如，下次你购买沐浴露的地方，买一个自己用，另外一个存放着，在将来作为礼物送给别人。

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"It's a 'buy one, get one free' deal," said Douglas Kenney, a professor at the University of Colorado Law School and the editor of an upcoming book that explores the nexus of water and energy.

“这就像是‘买一送一’的交易”，道格拉斯·肯尼说，他是科罗拉多州大学法学院的教授，同时也是一本探讨水资源与能源之间关系的书的编辑。

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Square eventually launched a more traditional loyalty program like a punch card in which customers could, say, buy ten and get one free.

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Sir Bruce also said cosmetic surgery deals, such as buy-one-get-one-free offers and handing out free breast surgery as prizes in raffles, were a "particularly distasteful" way of incentivising people to go under the knife.

BBC: 'Cosmetic crisis' waiting to happen

Inventory will be an issue as consumers snatch up discounts and buy-one get-one free offers.

FORBES: Black Friday 2011 Sales Arrive Early