Whatever you do, make sure, that it doesn't not only protect from scratches (like a sock would do) but protects the front (the screen) from punctual pressure. So make sure it has something flat and sturdy in front - solid cardboard, some metal or plastics.
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Lots of cases and covers in the Related side bar and in the search.
On the other hand you could quilt a pouch cover although this offers little protection from external pressure.You can hollow out the pages of an old book to fit the kindle inside - a hard back book will offer good protection.You can slip it into an old sock.
Here's one I prepared earlier, the concept works for any Ebook.https://www.instructables.com/id/A-leather-Ebook-case-21st-Century-style/