protected function findPrice(PriceInterface $searchPrice): ?PriceInterface
    {
        foreach ($this->prices as $price) {
            if ($price->getAmount() == $searchPrice->getAmount() && $price->getB2bGroupId() == $searchPrice->getB2bGroupId() && $price->getCurrency()->getId() == $searchPrice->getCurrency()->getId()) {
                return $price;
            }
        }

        return null;
    }