We maintain a small gallery of stock cinemagraphs that you can access for free:
https://drive.google.com/drive/u/1/folders/1Z2Rrn_KOcGZLt8VDLAm5Za0qLY3tGAku
If you’d like to download or purchase additional stock images for your projects, check out the following 3rd party sites:
Pexels.com
istockphoto.com
shutterstock.com