Tank IS-3 Low-poly 3D model is available on CGTrader for $199. Original author: vberd. Specs: 116288 polys, 116956 verts.
OBJ (OBJ, filesize: 33.4 MB), TEXTURES (Textures, filesize: 342 MB), OTHER (Other, filesize: 342 MB), MAX (Autodesk 3ds Max, filesize: 55.7 MB), 3DS (3D Studio, filesize: 9.98 MB), FBX (Autodesk FBX, filesize: 6.47 MB)