By default this is not supported.

There is one feature in beta. in application\config\cms_config.php you can add:

$config['enable_numeric_input'] = TRUE;

Then you can change field type for Sale to: INTEGER INPUT

After that number will be formated in this format: 12,345,678

You can enable beta feature numeric field in cms_config.php:

$config['enable_numeric_input'] = TRUE;

After that you can change field type in admin->real estate->fields->price related fields.

If you have issue with results ordering:

Please check application\models\estate_m.php, line around 592 you can find:

$value_n = str_replace("'", '', $value_n);
$value_n = str_replace("’", '', $value_n);
$value_n = str_replace(",", '', $value_n);

You can customize this code by your needs.

Example for format: #.###,00

$value_n = str_replace("'", '', $value_n);
$value_n = str_replace("’", '', $value_n);
$value_n = str_replace(".", '', $value_n); // to remove dot
$value_n = str_replace(",", '.', $value_n); // to replace , with dot

After that you should edit->save your available properties.

Regarding filters on search form:

/* [START] NumericFields */

$(function() {
    <?php if(config_db_item('swiss_number_format') == TRUE): ?>
    
    $('input.DECIMAL').number( true, 2, '.', '\'' );
    $('input.INTEGER').number( true, 0, '.', '\'' );
     
    <?php else: ?>
    
    $('input.DECIMAL').number( true, 2 );
    $('input.INTEGER').number( true, 0 );
    
    <?php endif; ?>
});

/* [END] NumericFields */

$config['swiss_number_format'] = TRUE;

And customize example code by your wish.

You can also customize number formatting in jquery plugin code:

/ templates / bootstrap2-responsive / assets / js / jquery.number.js
Change line 139 and 140 to define the point and the comma

Link to jquery plugin which is used:

https://github.com/customd/jquery-number