Cessna 421 Golden Eagle V11 (Polygon mesh 3D model) is available on CGTrader for $89. Original author: Dreamscape. Specs: 69712 polys, 37718 verts.
STL (Stereolithography, filesize: 1.1 MB), OBJ (OBJ, filesize: 1.19 MB), OTHER (Other, filesize: 5.23 MB), DXF (DXF, filesize: 1.2 MB), LWO (Lightwave, filesize: 335 KB), DWG (AutoCAD, filesize: 1.2 MB), MAX (Autodesk 3ds Max, filesize: 460 KB), W3D (Shockwave 3D, filesize: 951 KB), 3DM (Rhinoceros 3D, filesize: 1.08 MB), 3DS (3D Studio, filesize: 490 KB), SKP (Sketchup, filesize: 4.16 MB)