I can provide all the sources used for the company I used to work for, however that's irrelevant if you as you said wanted to learn how to fish.
Any and every company selling data and there are thousands is in fact a source you would need to deal with to be removed from the sites that sell it. If you think this answer isn't specific enough, you're not going to achieve anything by me spoonfeeding you info for one such company.
Any and every company selling data and there are thousands is in fact a source you would need to deal with to be removed from the sites that sell it. If you think this answer isn't specific enough, you're not going to achieve anything by me spoonfeeding you info for one such company.