Disc Harrow (Polygon mesh 3D model) is available on CGTrader for $129. Original author: 3D-Horse. Specs: 1529620 polys, 1579474 verts.
OBJ (OBJ, filesize: 49.9 MB), 3DS (3D Studio, filesize: 26.3 MB), LWO (Lightwave, filesize: 20.9 MB), C4D (Cinema 4D, filesize: 15.7 MB), MAX (Autodesk 3ds Max, filesize: 48 MB), MA (Autodesk Maya, filesize: 31.2 MB), HRC (Autodesk Softimage, filesize: 22.4 MB)