Stylized Dungeon Modular 3D Kit

I’m building an indie game and need a complete modular kit that lets me snap together a medieval dungeon in-engine. The visual direction is Semi-realistic/fantasy: think stylised forms with enough surface detail and believable materials to feel immersive without chasing photorealism... (Budget: $250 - $750 USD, Jobs: 3D Design, 3D Game Art, 3D Modelling, 3D Rendering, Blender, Visual Effects)