72 car collection (Polygon mesh 3D model) is available on CGTrader for $30. Original author: prajjwal. Specs: 240865 polys, 54781 verts.
DWG (AutoCAD, filesize: 588 MB), OBJ (OBJ, filesize: 270 MB), DAE (Collada, filesize: 298 MB), STL (Stereolithography, filesize: 134 MB), SKP (Sketchup, filesize: 176 MB), DXF (DXF, filesize: 1.66 GB), 3DS (3D Studio, filesize: 155 MB)