Guten Tag,
Regarding implementation of your project, I offer a .Net desktop application.
This application works based on finder schedulers. It means in this application, you will be able to create one or more schedulers that search both site(eBay and Amazon) in specific periods.
I develop a user friendly GUI that gives you the ability to create scheduler with specific periods and some filters such as (Minimum/Maximum number of feedback, Product name, category, date and ect.)
The application's normal routine is:
-Application runs as a service on your computer.
-In every specific time, service will monitor both web sites via APIs and saves the result in a temporary list(on local database)
-When you open the application GUI, you will see all unread temporary lists, you can select one or more lists and save them in MS Excel or other requested format.
-In addition you can run each scheduler manually.
I also offer another feature that can be add to your app:
-Notification: every time scheduler runs, an email is sent to your mail box as a notification.
I am looking forward to hearing from you to discuss details.
Regards,
Ara