Greetings free articles and then reselling
Here go
You need a find website that list expiry domain that are going expiry soon for example go Daddy domain https://auctions.godaddy.com/
Here you get a huge list of domains. You can sort them by many metrics. I like to choose only .com domains because there are a lot of pages in foreign languages which I don't want. In the advanced search, I also choose domains that are at least 2 years old.
Now open http://web.archive.org
G o through the list from GoDaddy and search for all the websites on web.archive.org
Within 10 minutes I found this website eternallifestyles.com
You can see in the picture that the Archive has info on it Since 2012
I checked the date of October, 2016.
Here's the main site. It's in the health niche with "How to..." articles etc
Now when you've found a website with articles that are worth saving, you need to check if the articles are unique and not have duplicate content.
I use copyscape.com
I pasted the article, and it shows that there are no duplicates
And that's how it's done. Yes, it might take time to find something of value, but heck, it's free content. So if you're short of funds you can use this for filler articles for your website. Or you might even find a gold mine website with hundreds of unused articles that would save you potentially hundreds of dollars.
I'm sure that by posting this example, this site will get used instantly, but it is just to show how it's done.
Hope it helps you guys! Happy hunting!