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$dbPrice = CPrice::GetList(
            array("QUANTITY_FROM" => "ASC", "QUANTITY_TO" => "ASC", 
              "SORT" => "ASC"),
            array("PRODUCT_ID" => $arResult['PRODUCT_ID']),
            false,
            false,
            array("ID", "CATALOG_GROUP_ID", "PRICE", "CURRENCY", 
              "QUANTITY_FROM", "QUANTITY_TO")
         );
         while ($arPrice = $dbPrice->Fetch())
         {
            $arDiscounts = CCatalogDiscount::GetDiscountByPrice(
               $arPrice["ID"],
               $USER->GetUserGroupArray(),
               "N",
               SITE_ID
            );
            $discountPrice = CCatalogProduct::CountPriceWithDiscount(
               $arPrice["PRICE"],
               $arPrice["CURRENCY"],
               $arDiscounts
            );
            $arPrice["DISCOUNT_PRICE"] = $discountPrice;

            $arResult['TOVAR']['PRICES'][] = $arPrice;
         }
 

$dbPrice = CPrice::GetList(
            array("QUANTITY_FROM" => "ASC", "QUANTITY_TO" => "ASC", 
              "SORT" => "ASC"),
            array("PRODUCT_ID" => $arResult['OFFERS'][$i]['ID']),
            false,
            false,
            array("ID", "CATALOG_GROUP_ID", "PRICE", "CURRENCY", 
              "QUANTITY_FROM", "QUANTITY_TO")
         );
         while ($arPrice = $dbPrice->Fetch())
         {
            $arDiscounts = CCatalogDiscount::GetDiscountByPrice(
               $arPrice["ID"],
               $USER->GetUserGroupArray(),
               "N",
               SITE_ID
            );
            $discountPrice = CCatalogProduct::CountPriceWithDiscount(
               $arPrice["PRICE"],
               $arPrice["CURRENCY"],
               $arDiscounts
            );
            $arPrice["DISCOUNT_PRICE"] = $discountPrice;

            $arResult['OFFERS'][$i]['PRICES'][] = $arPrice;
            
         }
         $i++;
         }
         //тут получаем максимальную и минимальные цены товара
         $price_min = 10000000000000;
         $price_max = 0;
         if(is_array($arResult['OFFERS'])) {
            foreach($arResult['OFFERS'] as $offer) {
               if(is_array($offer['PRICES'])) {
                  foreach ($offer['PRICES'] as $price) {
                     $pr = CCurrencyRates::ConvertCurrency($price['DISCOUNT_PRICE'], $price['CURRENCY'], $arParams['CURRENCY_ID']);
                     if($price_max<$pr) $price_max = $pr;
                     if($price_min>$pr) $price_min = $pr;
                  }
               }
            }
         }
         if(is_array($arResult['TOVAR']['PRICES'])){
            foreach($arResult['TOVAR']['PRICES'] as $price) {
               $pr = CCurrencyRates::ConvertCurrency($price['DISCOUNT_PRICE'], $price['CURRENCY'], $arParams['CURRENCY_ID']);
               if($price_max<$pr) $price_max = $pr;
               if($price_min>$pr) $price_min = $pr;
            }
         }
         if($price_min<$price_max) {
            $arResult['PRICE_MIN'] = $price_min;
            $arResult['PRICE_MAX'] = $price_max;
         }