Kobelco SK180NLC-11 Excavator (Subdivision ready 3D model) is available on CGTrader for $139. Original author: Polygate. Specs: 895719 polys, 913041 verts.
OBJ (OBJ, filesize: 136 MB), BLEND (Blender, filesize: 132 MB), FBX (Autodesk FBX, filesize: 42 MB), 3DS (3D Studio, filesize: 9.6 MB), MAX (Autodesk 3ds Max, filesize: 445 MB), TEXTURES (Textures, filesize: 21.9 MB), MEL (Maya Mel Script, filesize: 21.9 MB), C4D (Cinema 4D, filesize: 83.1 MB), MA (Autodesk Maya, filesize: 117 MB)