to filter the output of prices in some shape or form other than whats already available from wppizza->layout, you can use the following filter in your theme’s functions.php

add_filter('wppizza_filter_output_format_price', 'my_prefix_price_format');
function my_prefix_price_format($price){
/* 
if - for example - you do not want to display trailing zeros , you could simple do the below
*/
/* if your language uses period as decimal separator */
$price = floatval(str_replace(',', '.', str_replace(',', '', $price)));
/* if your language uses commas as decimal separator, use the below instead */
//$price = floatval(str_replace(',', '.', str_replace('.', '', $price)));
/*
you can go one step further and format thousand separators again.
just uncomment the below
*/
//$format = explode('.', $price);
//$price = number_format_i18n( $price, empty($format[1]) ? 0 : strlen($format[1]) );
return $price;
}