Julio40,
valeu pela resposta. Consegui resolver a questão :
$search_query = $wpdb->get_results(“select $wpdb->posts.ID from $wpdb->posts where $wpdb->posts.post_title LIKE ‘%”.$post->post_title.”%’ and $wpdb->posts.post_type = ‘products’ and $wpdb->posts.post_status = ‘publish’ order by (select $wpdb->postmeta.meta_value from $wpdb->postmeta where $wpdb->postmeta.post_id=$wpdb->posts.ID and $wpdb->postmeta.meta_key like \”price\” )+0 asc”);
apenas exclui o +0 asc e está funcionando.