Нашел решение , может пригодится кому.
$SKU = CCatalogSKU::IsExistOffers($PRODUCT_ID, 1);
if($SKU){
$arFilter = 1;
$arElementID = Array($PRODUCT_ID);
$arOrder = Array();
$arSelectFields = array('ID');
$arSelectProperties = Array('PROPERTY_RAZMER_ATTR_L');
$arPrices = CIBlockPriceTools::GetCatalogPrices(1, array('BASE'));
$items = CIBlockPriceTools::GetOffersArray(
$arFilter,
$arElementID,
$arOrder,
$arSelectFields,
$arSelectProperties,
0,
$arPrices
);
foreach ($items as $k => $v){
$items[$k]["PROPERTIES"]["PRICES"] = GetCatalogProductPrice($v["ID"], 1);
$json['SKU'][$k]['NAME'] = $items[$k]["PROPERTIES"]["RAZMER_ATTR_S"]["VALUE"];
$json['SKU'][$k]['PRICE'] = $items[$k]["PROPERTIES"]["PRICES"]["PRICE"];
}
echo "";
var_dump($json);
}else{
print 0;
}
