$19 sea stones Low-poly 3D model by icekazim. Available on CGTrader with 800 polys and 402 vertices. Check it out on CGHub.
OBJ (OBJ, filesize: 97 MB), FBX (Autodesk FBX, filesize: 48.5 MB), JPG (JPG, filesize: 48.5 MB), BLEND (Blender, filesize: 48.5 MB)