Update Product Price Programmatically

updateprice.php

<?php

// drop into Magento root directory updateprice.php and execute

require_once('app/Mage.php');
ob_implicit_flush(true);
umask(0);
set_time_limit(0);
ini_set('display_errors', 1);
ini_set('memory_limit', '2048M');
Mage::setIsDeveloperMode(true);
Mage::app();
Mage::app()->setCurrentStore(Mage_Core_Model_App::ADMIN_STORE_ID);

function productCallback($args) {
    
    $product = Mage::getModel('catalog/product');
    
    // set product data from row iterator
    $product->setData($args['row']); 
    $product_data = array();

    // get current price 
	$price = $product->getPrice();

	// add additional value to existing price
	$product->setPrice($price + .70);

    echo "Updating Price for: ".$product->getName()."<br />\n\r";    
	$product->save();
	$product->clearInstance();	
	unset($price);
}

try {

	$productModel = Mage::getModel('catalog/product');

	// get collection of products
	$collection = Mage::getResourceModel('catalog/product_collection')
            ->addAttributeToSelect('*')
            ->addAttributeToFilter('type_id','Booking/reservation'); // define product type 

    // output SQL query for collection
	echo $collection->addAttributeToSelect('*')->getSelect();

	// use magento iterator callback to not consume memory for large catalogs
	Mage::getSingleton('core/resource_iterator')->walk($collection->getSelect(), array('productCallback'), array('arg1' => '===='));
 
} catch (Exception $e) {
    zend_debug::dump($e);
} 

Answer for: https://magento.stackexchange.com/questions/90946/script-to-update-product-prices-for-certain-product-types/90948