Check out Star Trooper Wars Helmet Armor Low-poly 3D model on CGTrader for $9. High-quality mesh by 3dcreative: 2700 polys, 1600 vertices.
OBJ (OBJ, filesize: 368 KB), FBX (Autodesk FBX, filesize: 142 KB), MAX (Autodesk 3ds Max, filesize: 320 KB), 3DS (3D Studio, filesize: 55 KB)