It's cheaper to travel midweek.

在星期中间旅行较便宜。

《牛津词典》

Unleaded is cheaper than diesel.

无铅汽油比柴油便宜。

《牛津词典》

Coal is actually cheaper than gas.

煤炭实际上比煤气便宜。

《柯林斯英汉双解大词典》

She said buying the cheaper imported rice worked well until the worldwide food crisis of two thousand eight.

VOA: special.2010.03.30

One reason for this is obvious; it's cheaper not to pay people, but the other reason is more interesting.

这样做的其中一个原因很明显;,不用付钱，当然就能省点了，但另一个原因更有意思。

耶鲁公开课 - 心理学导论课程节选

And so if you can cut out all of that advertising budget, then you can sell the product for much cheaper.

所以如果你把广告预算都去掉，产品就可以卖得便宜很多。

广告和价格的关系 - SpeakingMax英语口语达人

Advance tickets are cheaper but there is no solid data on the cost or number sold.

BBC: Have train fares gone up or down since British Rail?

Thirdly, we're envisioning a cheaper, mobile mobile iPad fitting into classrooms much better than the original.

ENGADGET: blogger-avatar

If you find the same room cheaper elsewhere, the company will pay you the difference.

BBC: A boom in same-day hotel booking apps