WP Alchemy

Using this great plugin is it possible to sort by one of my custom meta_values.
eg. I have a custom meta which displays the price, how do I sort in my query to display based on this price.
This is my current state, meta_key => price_low being the name of the field I’d like to base my sort. This set up below doesn’t work unfortunately.

<?php
  $paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
  $post_per_page = 12; // -1 shows all posts
  $args=array(
    'post_type' => 'accommodations',
    'community' => 'central-area',
    'paged' => $paged,
    'posts_per_page' => $post_per_page,
    'meta_key' => 'price_low',
    'orderby'=> 'ASC'
  );
  $temp = $wp_query;  // assign orginal query to temp variable for later use
  $wp_query = null;
  $wp_query = new WP_Query($args);
  if( have_posts() ) :?>

Many thanks in advance.