Marketplace scraper and alert service

I'm looking for someone to create a marketplace scraper and alert service for personal use that is built on HTML/CSS and integrated with existing websites. This scraper and alert service will be used to monitor changes on various marketplaces to ensure that I never miss a great deal. It should be simple, reliable, and provide me with quick, easy access to the alerts. The freelancer I'm looking for should have expertise in HTML/CSS and be experienced in marketplaces scraping and alert services. I'm looking for the best possible solution to meet my needs.