Hi Rina
The files you need to look for are .glb, which is the binary form of the glTF format:
glTF (Graphics Library Transmission Format or GL Transmission Format and formerly known as WebGL Transmissions Format or WebGL TF) is a standard file format for three-dimensional scenes and models. (source: Wikipedia).
I have come across a few sites where you can find these 3D models:
The pricing may vary from free to a few dollars. Also, make sure to check any licensing for the files.
------------------------------
Peter Horsbøll Møller
Principal Presales Consultant | Distinguished Engineer
Precisely | Trust in Data
------------------------------