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AddEventHandler("catalog", "OnGetOptimalPrice", "MyGetOptimalPrice");
function MyGetOptimalPrice($productID, $quantity = 1, $arUserGroups = array(), $renewal = "N", $arPrices = array(), $siteID = false, $arDiscountCoupons = false)
{
    if (SITE_ID == 's1') {
        global $USER;
        // Если пользователь не авторизован
        if (!$USER->IsAuthorized()) {

            $arOptPrices = CCatalogProduct::GetByIDEx($productID);

            // Проставляем цену с id = 1
            $price = $arOptPrices['PRICES'][1]['PRICE'];
            $catalog_group_id = 1;

            // Отдаем результат в массиве
            $priceArr = array(
                'PRICE' => array(
                    "ID" => $productID,
                    'CATALOG_GROUP_ID' => $catalog_group_id,
                    'PRICE' => $price,
                    'CURRENCY' => "RUB",
                    'ELEMENT_IBLOCK_ID' => $productID,
                    'VAT_INCLUDED' => "Y",
                ),
                'DISCOUNT' => array(
                    'VALUE' => $discount,
                    'CURRENCY' => "RUB",
                ),
            );

            return $priceArr;
        }
    }
}