Dehavilland DHC-7 Blue Ridge American (Polygon mesh 3D model) is available on CGTrader for $89. Original author: Dreamscape. Specs: 57966 polys, 31472 verts.
STL (Stereolithography, filesize: 755 KB), OBJ (OBJ, filesize: 958 KB), 3DS (3D Studio, filesize: 347 KB), 3DM (Rhinoceros 3D, filesize: 958 KB), MAX (Autodesk 3ds Max, filesize: 362 KB), OTHER (Other, filesize: 2.01 MB), LWO (Lightwave, filesize: 722 KB), W3D (Shockwave 3D, filesize: 1.02 MB), TEXTURES (Textures, filesize: 1.72 MB)