Optimize Two Game Environments

I have two fully-modelled environments already exported as FBX files. They look fine, but the poly count is far too high for real-time use, especially in areas that players will never see. Your task is... (Budget: $10 - $30 USD, Jobs: 3D Animation, 3D Design, 3D File Scaling, Slicing & Print Preparation, 3D Game Art, 3D Modelling, 3ds Max, Game Development, Maya)