// Всего 2 города
        $citys = $this->city->with('goods')->get();

        $priceList = [];

        foreach ($citys as $city) {

            $cityName = $city->name;

            $priceList[$cityName] = [
                'city_id'   => $city->id,
                'price'     => []
            ];

            foreach ($city->goods as $goods) {
                $priceList[$cityName]['price'][$goods->name] = [
                    'goods_id'  => $goods->id,
                    'weights'   => []
                ];
                echo $cityName . PHP_EOL; // Будет выведено 2 разных города
                foreach ($goods->goodsPrice as $goodsPrice) {
                    echo $cityName . PHP_EOL; // А тут будет всегда только первый
                    $priceList[$cityName]['price'][$goods->name]['weights'][] = [
                        'weight'    => $goodsPrice->weight,
                        'cost'      => $goodsPrice->cost
                    ];
                }
            }
        }