$start_date = tribe_get_month_view_date();
$format_end_date = strtotime( tribe_get_month_view_date() ) ;
$end_date = date( 'Y-m-d', strtotime('+1 month', $format_end_date));
$events = tribe_get_events( array(
'eventDisplay' => 'custom',
'start_date' => $start_date,
'end_date' => $end_date
) );
foreach ( $events as $event ) {
echo tribe_get_cost($event->ID);
}