Reply To: Shortcode in customfield soes not show up in results

That highly depends on the output HTML. You could potentially change this line:

$meta_value = do_shortcode($meta_value);

..to maybe:

$meta_value = '<span class="aspcf_'.$cfield.'">' . do_shortcode($meta_value) . '</span>';

With that, the shortcode values will be printed into a span element with the classes ‘aspcf_pricemonth’ and ‘aspcf_availability’. Now, you can use custom CSS to style them as you want, for example:

span.aspcf_pricemonth {
    font-weight: bold;
    color: red;
}

span.aspcf_availability {
    font-weight: bold;
    color: blue;
}