十块钱一次，不过你是免费的。

It costs ten bucks. But you get it free.

youdao

她一点一点地付给我钱，而不是一次付清。

She paid me in dribs and drabs, not all at once.

《牛津词典》

她告诉我我每周都要存一次钱，而他们会在我的存折上盖印。

She told me I should make a deposit every week and they'd stamp my book.

《柯林斯英汉双解大词典》

One time, I paid a beggar when I was driving in my car and I was stopped to the stoplight,

有一次，我给过乞丐钱，当时我在开车，正在等红灯，

不做善事的理由 - SpeakingMax英语口语达人

I've never given them money before. Except for one time,

我之前也从未给过他们钱，就那一次。

不做善事的理由 - SpeakingMax英语口语达人