Ask HN: How do you integrate search on LLM?

I've used some AI Search services that they're using a Google as data sources.

However, when I figuring out how to grab search data from Google, it requires some additional price (or huge if the volume is too big) to get it. (Or do some sneaky things to make a real search on Google. But seems like provider wouldn't allow this.)

My question is, how do (or you if youre working on related sides) they get search results from google? and how does that cost?