24/7 Stock Alert Bot

I need a robust script—call it a bot if you like—that keeps an eye on a set of product URLs from Amazon India, Flipkart, Myntra, Croma, Instamart, and Zepto. Its single purpose is to check stock availability... (Budget: ₹12500 - ₹37500 INR, Jobs: Automation, Java, Node.js, PHP, Python, Selenium, Software Architecture, Web Scraping)