You can download various 3D data from the 3D model-sharing and publishing platform Sketchfab.

Individual 3D data is stored on a page like the following one.

If there is a “Download” button on the page then you can obtain the data.

If you click on it you will be taken to the license confirmation screen, which will confirm the relevant usage policy.

In the case of downloading for commercial purposes, read the policy very carefully and keep in mind the specific rules that you have to follow.