Design an Amazon price tracker.

Focus on identifying the core features that would make an Amazon price tracker valuable to users. Consider how users will interact with the tool, including functionalities like price alerts, historical price trends, and comparison with competitors. Discuss the technical aspects of data scraping or API integration to gather pricing information, and address how you would ensure data accuracy and timeliness. Additionally, think about user experience design—how will you present the data in a way that is intuitive and engaging? Finally, consider any potential challenges, such as Amazon's terms of service or rate limits on data access, and how you would mitigate these issues.