Check out StuG III - Ausf G - 10 - Early Production 3D model on CGTrader for $119. High-quality mesh by Panaristi: 818809 polys, 820594 vertices. Textured, UV Mapped.
OBJ (OBJ, filesize: 118 MB), 3DS (3D Studio, filesize: 49 MB), FBX (Autodesk FBX, filesize: 101 MB), C4D (Cinema 4D, filesize: 52.2 MB), LWO (Lightwave, filesize: 59.8 MB)