I use a number of online resources to find newspaper articles about my ancestors.
1) I have a paid GenealogyBank ($$) annual subscription. GenealogyBank has the San Diego newspapers from 1868 to the present on their site and it has been very helpful for the five generations of my San Diego ancestral families. I use it frequently to find newspaper articles for ancestral families across the country. It does not have everything, but it has a lot.
2) I can access NewspaperARCHIVE ($$) newspapers using my Findmypast.com ($$) subscription. This site has different papers than GenealogyBank. The Ancestry.com newspapers are also from NewspaperARCHIVE, I think, but I don't know how complete the Ancestry.com collection is.
3) I use Chronicling America (FREE!) on the Library of Congress site. This has a number of digitized newspapers from about 1800 to 1923, but is not very comprehensive. It seems to have different newspapers than the other two above.
4) I have a Fold3.com ($$) paid subscription, and it has a limited number of digitized historical newspapers before 1923, including the Atlanta Constitution, Chicago Tribune, San Francisco Chronicle, and Washington Post.
5) I do not have a Newspapers.com ($$) subscription and have not used the site yet. I probably should!
6) Kenneth Marks has a blog called The Ancestor Hunt and in recent years he has specialized in digitized newspapers, both free and subscription. His Newspapers Research Links page has links to online historical newspapers for each U.S. state. He updates them occasionally. This is a really big task!
When I want to know what is available, I've found that Ken's articles are the most up-to-date for online digitized newspapers.
Here is the Indiana Online Historical Newspapers page:
I need to find the obituary for my 2nd great-grandfather, David Auble (1817-1894) who died in Terre Haute, Indiana on 22 March 1894. I have a newspaper clipping in my family scrapbook, but it is damaged and may be incomplete.
I checked the list of online newspapers for Terre Haute, and did not see any for 1894. Perhaps I missed it? Therefore, I need to write, or visit, a Terre Haute repository (perhaps a historical society?), or contact a Terre Haute genealogical society to see if they can find the obituary for me.
Thank you to Lisa for asking the question, and I hope my answer has been helpful.