Perhaps you can buy one bottle of shampoo and get one free. The price of shampoo has fallen by 50 per cent but you spend the same and get two bottles.

比如说洗发水买一赠一，也就是说洗发水的价格降低了50%，或者说用同样的价格购买了两瓶。

youdao

The firm said the offer meant that smaller households would not be forced to throw out "buy one, get one free" items before their use-by date.

BBC: Tesco launches Buy One Now, Get One Free... Later

While Microsoft has closed the door on one method used by pirates to get as copy of Windows for free (leaving us to pick up the bill by keeping prices higher than they need to be), it seems that anther door was left open.

FORBES: Microsoft Blunder Gives Pirates Free Copies Of Windows 8 Pro

If you do, you are about to get one step closer to BPA-free shopping thanks to a proactive move by the supermarket chain to ban BPA from its canned foods and receipts.

FORBES: Kroger bans BPA from store brands and receipts