<?php if($_product->price==0): ?>
     <?php  echo 'Price on request'; ?>
<?php else: ?>
     <span class="price-yo">Price</span>
     <?php echo $this->getChildHtml('product_type_data') ?>
<?php endif; ?>

<?php if($_product->price==0): ?>
        <div class="price-req-list">Price on request</div>
<?php else: ?>
    <div id="priceholder-list-upsell"><?php echo $this->getPriceHtml($_link, true, '-upsell') ?></div>
<?php endif; ?>

public function __get($var)
{
    $var = $this->_underscore($var);
    return $this->getData($var);
}

public function getPrice()
{
    if ($this->_calculatePrice || !$this->getData('price')) {
        return $this->getPriceModel()->getPrice($this);
    } else {
        return $this->getData('price');
    }
}