$items = $order->getAllItems();
foreach($items as $key => $value){
    $product =  $this->_product->create()->load($value->getProductId());
    $product->setPrice(29.0000);
    //echo '<pre>';print_r($product->getPrice());
    $quote->addProduct(
        $product,
        intval($value->getQtyOrdered())
    );
}