Check out Roman helmet Low-poly 3D model on CGTrader for $5. High-quality mesh by CartoonAnvil: 4000 polys, 4000 vertices. Textured, UV Mapped.
STL (Stereolithography, filesize: 149 MB), OBJ (OBJ, filesize: 206 MB), ZTL (Zbrush, filesize: 149 MB), FBX (Autodesk FBX, filesize: 57.5 MB)