No, you cannot “buy” people’s personal data (name, phone #, address, email, etc) from Google.
Yes, sale of a business unit usually includes the customer contracts, leads and historical data of that business unit. No, there isn’t anything nefarious about that, and every other business you transacted with does the same thing.
Yeah sure there is a cottage industry trying to use google’s data to augment other data sources, but that’s not “Google selling my personal data”.