app/code/core/Mage/Catalog/Block/Product.php

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<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category   Mage
 * @package    Mage_Catalog
 * @copyright  Copyright (c) 2008 Irubin Consulting Inc. DBA Varien (http://www.varien.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */


class Mage_Catalog_Block_Product extends Mage_Core_Block_Template
{
    protected $_finalPrice = array();

    public function getProduct()
    {
        if (!$this->getData('product') instanceof Mage_Catalog_Model_Product) {
            if ($this->getData('product')->getProductId()) {
                $productId = $this->getData('product')->getProductId();
            }
            if ($productId) {
                $product = Mage::getModel('catalog/product')->load($productId);
                if ($product) {
                    $this->setProduct($product);
                }
            }
        }
        return $this->getData('product');
    }

    public function getPrice()
    {
        return $this->getProduct()->getPrice();
    }

    public function getFinalPrice()
    {
        if (!isset($this->_finalPrice[$this->getProduct()->getId()])) {
            $this->_finalPrice[$this->getProduct()->getId()] = $this->getProduct()->getFinalPrice();
        }
        return $this->_finalPrice[$this->getProduct()->getId()];
    }

    public function getPriceHtml($product)
    {
        $this->setTemplate('catalog/product/price.phtml');
        $this->setProduct($product);
        return $this->toHtml();
    }
}

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