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Integrating error handling mechanisms would improve the robustness of the script. For example, if the shipping section fails to load or the selector changes, the script could log the error and attempt a retry. Additionally, capturing screenshots of the failed pages would assist in debugging.

Another enhancement could involve scheduling this script to run periodically to track changes in discounts or new promotions on the homepage. This could be done using cron jobs in a Linux environment.

The script could be improved by adding error handling for pages where the delivery options section might not exist. A simple check could be added to log cases where no delivery information is found.

To improve security, the script could include input sanitization and validate the URLs being scraped. This would prevent potential vulnerabilities if user input is passed directly to the script, ensuring that only valid, whitelisted domains are processed. Additionally, adding SSL verification for requests would enhance security when accessing HTTPS sites.