but1head

[[+availability:availability]]

<?php

$availability = $input; (ваш плейсхолдер)
$output = '';
switch($availability){
	case 0: $output = 'равен 0'; break;
	case 1: $output = 'равен 1'; break;
	case 'Под заказ': $output = 'только под заказ';
	default: $output = 'ни равен ничему'; break;
}
return $output;

<td><span id="price-count"> [[+price:mpy=`[[+count]]`]] </span></td>

$('input[name="count"]').change(function(){
	var count = $(this).val(); 
	var total = $('#price-count');
	
	....

	total.text(count * price);
});

[2015-09-29 00:04:53] (ERROR @ /index.php) Entry point for Slackify not defined in system settings

[2015-09-27 22:18:10] (ERROR @ /index.php) Could not load class: slackify from slackify.
[2015-09-27 22:18:10] (ERROR @ /index.php) Problem getting service slackify, instance of class slackify, from path