Dehaviland DHC-8 400 Air South (Polygon mesh 3D model) is available on CGTrader for $89. Original author: Dreamscape. Specs: 39467 polys, 23150 verts.
STL (Stereolithography, filesize: 569 KB), OBJ (OBJ, filesize: 677 KB), 3DS (3D Studio, filesize: 278 KB), OTHER (Other, filesize: 3.73 MB), 3DM (Rhinoceros 3D, filesize: 782 KB), LWO (Lightwave, filesize: 609 KB), MAX (Autodesk 3ds Max, filesize: 522 KB), W3D (Shockwave 3D, filesize: 1.33 MB)