Quick shot:
$countries = get_pages(array(
"hierarchical" => 0,
"sort_column" => "menu_order",
"sort_order" => "desc",
"meta_key" => "page_type",
"meta_value" => 2,
));
$page_ids = array();
foreach ( $countries as $country ) {
$page_ids[] = $country->ID;
}