Woocommerce – Bulk Price Discount in cart

Do give a cheaper unit price if more than 1 is purchased

//Add $100 discount per item if quantity = 2 or more
add_action( 'woocommerce_before_calculate_totals', 'ns_add_bulkcustom_price', 10, 1);
function ns_add_bulkcustom_price( $cart_obj ) {

    //  This is necessary for WC 3.0+
    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;

    foreach ( $cart_obj->get_cart() as $key => $value ) {

        //Only action on Product 827
        if ($value['product_id'] == 827)  {
            $regprice = $value["data"]->get_price();

            echo '<pre>';
                print_r(  $regprice-100);
            echo '</pre>';

            if ($value['quantity'] > 1) {
                $value['data']->set_price( $regprice-100 );
            }
           
        }
    }
 }