I listed a gig offering custom web scraping scripts on Fiverr and Upwork. Within a week, I got my first few clients, each paying $50-$200 per script. The demand was bigger than I expected.
Instead of writing custom scripts for every client, I made a generic scraper that could handle multiple websites. I put it up for sale on Gumroad and Sellix for $19.99, and people started buying it.