I wanted to show posts from limited deals plugin. Order it by the deal with the most time to expiration, and then ensure that the post contained a limited deal (via checkbox), and show the latest post from there... here is what I ended up with :)

query_limited_deals.php

<?php 
	$args = array(  
		'post_type' => 'product',  
		'meta_key' => '_limited_dates_to',  
		'orderby' => 'meta_value',
		'order' => 'DESC',
		'meta_query' => array(
			array(
				'key' => '_limited',
				'value'	=> 'yes',
				'compare' => '=',
			),

		),
		'posts_per_page' => 1  
		);  
$limited_query = new WP_Query( $args );