Best way to run a web scraper from my S3 website and save the returned information to a database

I currently have a website hosted on S3 with a working RDS database connection. I would like to run a dynamic web scraper from this site that activates based on user input. Ideally, the user will click a button which will activate a search for a specific product across a specified list of retail sites. This data will be displayed on the site and also saved to the database. It doesn't matter if the data goes directly to the site or to the database. I would like to use an existing web scraping tool such as Scrapy. What is the best way to handle this?