There are more than enough people on the Internet willing to write quick and cheap Internet articles.
I’m not one of them. I believe in proper research and I don’t think the Internet is the best source of information. So my articles will most likely be too expensive for you, especially if you want all rights.
You can look at some stuff I have on Helium.
They will be more than willing to sell you any articles on the site (not just mine) at stock content rates, which are very low.
You can also commission articles through their Marketplace. That has always been my main interest in that site.