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switch($_GET['sort_type']) {
    case 'sort:price-asc':
        // $args['showposts'] = 1;
        $args['meta_query'][] =  array('d_clause' => array('key' => 'price', 'compare' => 'EXISTS',),);            
        $args['orderby'] = array('d_clause' => 'ASC',);
    break;
    case 'sort:price-desc':
        // $args['showposts'] = 2;
        $args['meta_query'][] =  array('d_clause' => array('key' => 'price', 'compare' => 'EXISTS',),);            
        $args['orderby'] = array('d_clause' => 'DESC',);
    break;
    case 'sort:duration-asc':
        // $args['showposts'] = 3;
        $args['meta_query'][] =  array('d_clause' => array('key' => 'duration', 'compare' => 'EXISTS',),);            
        $args['orderby'] = array('d_clause' => 'ASC',);
    break;
    case 'sort:duration-desc':
        // $args['showposts'] = 4;
        $args['meta_query'][] =  array('d_clause' => array('key' => 'duration', 'compare' => 'EXISTS',),);            
        $args['orderby'] = array('d_clause' => 'DESC',);
    break;
}