WeatherTech has floorliners listed for the Model 3 now. However, only the 2nd row is currently available at $150. No actual pictures either.
2018 Tesla Model 3 | WeatherTech FloorLiner - car floor mats liner, floor tray protects and lines the floor of truck and SUV carpeting from mud, snow, water and dirt | WeatherTech.ca
2018 Tesla Model 3 | WeatherTech FloorLiner - car floor mats liner, floor tray protects and lines the floor of truck and SUV carpeting from mud, snow, water and dirt | WeatherTech.ca