Hello Christos, thank you for reaching out to the Microsoft Community. I'm here to help with your questions or issues. Just note – this is a place where passionate Microsoft users help each other, we don't work directly for Microsoft.
Microsoft has not yet revealed how much Extended Security Updates (ESU) for Windows 10 will cost for home users. They have only provided pricing information for businesses and educational institutions.
According to Microsoft, they will announce pricing details for consumers later on their consumer end-of-support page. For updates, you can check these pages periodically:
https://learn.microsoft.com/en-us/lifecycle/faq...
https://learn.microsoft.com/en-us/lifecycle/faq...
Feel free to ask if you have any other questions or if there's anything else I can assist you with.