Python E-Commerce Alert Script

I need a single-entry Python solution that constantly watches product pages on Amazon, Flipkart, Croma, Reliance Digital, Vijay Sales, Samsung, Apple and any other store I decide to add next. The script... (Budget: ₹600 - ₹1000 INR, Jobs: Amazon Web Services, BeautifulSoup, JSON, PHP, Python, Selenium, SQLite, Web Scraping)