Check out Sci-Fi Robot AAA Game Ready Character with 8K PBR materials Low-poly 3D model on CGTrader for $189. High-quality mesh by artcloudstore: 78900 polys, 50000 vertices. Rigged, PBR, Textured.
UASSET (UnrealEngine, filesize: 561 MB), OBJ (OBJ, filesize: 1.17 MB), FBX (Autodesk FBX, filesize: 148 MB), MA (Autodesk Maya, filesize: 152 MB), UNITYPACKAGE (Unity 3D, filesize: 236 MB), TEXTURES (Textures, filesize: 309 MB)