Realtime E-commerce Price Alert Tool

I’m looking for a lightweight, reliable solution that tracks the live prices of any product I choose on Amazon, Flipkart, Myntra and Nykaa, then emails me the moment the price drops below a threshold I set... (Budget: ₹12500 - ₹37500 INR, Jobs: BeautifulSoup, Database Management, JavaScript, Python, Scrapy, Selenium, Software Architecture, Web Scraping)