You can also see if some official publishing houses sell them.
Photocopy is an intact copy of the original, and the copyright remains the copyright of the original book. In order to save money, photocopying appeared. After obtaining the copyright authorization of others, completely copy other people's books and mark the copyright as the original publishing house. The copyright of the photocopy is still the copyright of the original book. And marked "photocopying", which has no influence on the publishing house and the original author.