Check out Prison Cage Low-poly 3D model on CGTrader for $7. High-quality mesh by edplus: 576 polys, 384 vertices. Textured, UV Mapped.
STL (Stereolithography, filesize: 12.3 MB), OBJ (OBJ, filesize: 12.3 MB), DAE (Collada, filesize: 12.4 MB), FBX (Autodesk FBX, filesize: 12.3 MB)