Check out Seamless Gothic pattern 31 Low-poly 3D model on CGTrader for $10. High-quality mesh by tatoyellow.
STL (Stereolithography, filesize: 102 MB), OBJ (OBJ, filesize: 54.3 MB), FBX (Autodesk FBX, filesize: 43.4 MB), 3DS (3D Studio, filesize: 33.1 MB)