wordpress sorting using array merge by price in ascending order but price with 0 must be show last

I'm using below code to filter the query on page and sort the post in ascending order by price. I'm getting desire output but my concern is , i want all price with 0 at last.

<?php
global $wp_query;
$args = array_merge( $wp_query->query_vars, array( 'orderby' => 'meta_value_num','meta_key' => 'price','order' => 'ASC'));
query_posts( $args );
?>

please help me guys...Thanks in advance

full code here:

<?php
/**
* The template for displaying Archive pages.
*
* Learn more: http://ift.tt/vTku09
*
* @package progression
*/

get_header('cars'); ?>
<?php get_template_part( 'page', 'vehicle-title' ); ?>
<div class="width-container">

<?php if ( have_posts() ) : ?>

<div id="page-title">
<h1 id="page-heading">
<?php if (is_tax('vehicle_type')) {
$term = get_term_by( 'slug', get_query_var( 'term' ), get_query_var( 'taxonomy' ) );
$tax_term_breadcrumb_taxonomy_slug = $term->taxonomy;
echo '' . $term->name . '';
}
?>
</h1>
</div><!-- close #page-title -->

<div id="4-content-container" class="tax-vehicle-container">
<?php echo do_shortcode('[vehicle_searchform include="make,model"]') ?> 

    <?php
    global $wp_query;
    $args = array_merge( $wp_query->query_vars, array( 'orderby' => 'meta_value_num','meta_key' => 'price','order' => 'ASC'));
    query_posts( $args );
 ?>



<?php
/* Start the Loop */
$count = 1;
$count_2 = 1;
?>

<?php while ( have_posts() ) : the_post();
if($count >= 5) { $count = 1; }
?>

<div class="grid4column-progression <?php if($count == 4): echo ' lastcolumn-progression'; endif; ?>">
<?php
get_template_part( 'content', 'vehicle');
?>

</div>
<?php if($count == 4): ?><div class="clearfix"></div><?php endif; ?>
<?php $count ++; $count_2++; endwhile; ?>

<div class="clearfix"></div>
<?php show_pagination_links( ); ?>

</div><!-- close #content-container -->

<?php else : ?>

<?php get_template_part( 'no-results', 'inventory' ); ?>

</div><!-- close #content-container -->
<?php endif; ?>

<?php get_sidebar( 'vehicle' ); ?>
</div><!-- close .width-container -->
<?php get_footer(); ?>