$regions = [
    'Челябинск' => 22160,
    'Екатеринбург' => 22130,
    'Тюмень' => 45045,
    'Курган' => 45053,
    'Москва' => 53369,
    'Уфа' => 45054
];
$arrPriceType = [];
foreach ($regions as $region) {
    $sql = "SELECT * FROM `b_iblock_element_prop_s6` where IBLOCK_ELEMENT_ID = " . $region;
    $sql_db = $DB->Query($sql);
    while ($regi = $sql_db->Fetch()) {
        $arrPriceType[$region] = $regi['PROPERTY_87'];
    }
}

$sects = "SELECT ID, CODE, NAME, DESCRIPTION, IBLOCK_SECTION_ID FROM `b_iblock_section` where IBLOCK_ID = 4 and ACTIVE='Y'";
$sects_db = $DB->Query($sects);
while ($sect = $sects_db->Fetch()) {
    $product_sql = 'SELECT * from b_iblock_element WHERE ACTIVE = "Y" and IBLOCK_ID=4 and IBLOCK_SECTION_ID='.$sect["ID"];
    $product_db = $DB->Query($product_sql);
    while ($product = $product_db->Fetch()){
        $offers = get_product_offers($product['ID']);
        foreach ($offers as $offer) {
            $prices = get_prices($offer);
            foreach ($prices as $price) {
                foreach ($arrPriceType as $reg => $priceType) {
                    if($price["PRICE_TYPE_ID"] == $priceType) {
                        if (empty($actual_price[$sect["ID"]][$reg]) || $actual_price[$sect["ID"]][$reg] > $price['NEW']) {
                            $actual_price[$sect["ID"]][$reg] = $price['NEW'];
                        }
                    }
                }
            }
        }
    }
    foreach ($actual_price[$sect["ID"]] as $key => $pr) {
        $response .= '<offer id="S' . $sect['ID'] . '-'. $key .'" available="true">';
        $response .= '<url><![CDATA[https://hypermarketmebel.ru/catalog/' . $sect['CODE'] . '?sr='.$key.']]></url>';
        $response .= '<price>' . $pr . '</price>';
        $response .= '<currencyId>RUB</currencyId>';
        $response .= '<name><![CDATA[' . $sect['NAME'] . ']]></name>';
        $response .= !empty($sect['DESCRIPTION']) ? '<description><![CDATA['.$sect['DESCRIPTION'].']]></description>' : '';
        $response .= '</offer>';
    }
}