public static function getPrice_list(){
    $model = array(
        0=>"0 - 250.000",
        1=>"250.000 - 600.000",
        2=>"600.000 - 1.000.000",
        3=>"1.000.000 -",
        4=>"Every",

    );
    return $model;
}

'price'=>array(self::HAS_MANY, 'UserAndApartmanPrice', 'user_and_apartman_id')

$criteria = new CDbCriteria;
$criteria->with = array( 'apartman','price');
$criteria->together = true;
if($_POST['sell_price'] != 4){
   if($_POST['sell_price'] == 0){
       // this is the question
   }
      ...
}

$model = UserAndApartman::model()->findAll($criteria);

$criteria = new CDbCriteria;
    $criteria->together = true;
    $list = UserAndApartman::getPriceList(0);
    $criteria->with = array(
        'description' => array(
            'condition' => 'main != :main AND valuta = :valuta AND value BETWEEN :value1 AND :value2',
            'params'    => array(
                ':main' => 10,
                ':valuta' => 1,
                ':value1' => $list[0],
                ':value2' => $list[1],
            )
        )
    );

public static function getPriceList( $id ) {
    $list = array(
        0 => array("0", "250.000"),
        1 => array("250.000", "600.000"),
        2 => array("600.000", "1.000.000"),
        3 => array("1.000.000", '9999999999999'),
        4 => array('0', '9999999999999'),
    );

    return $list[$id];
}