get_final_price_of_skus_for_certain_customer_group.php

<?php 
require_once 'app/Mage.php';
Mage::app();
//to overwrite limit but you need first to increase your memory limit
 $collection = Mage::getModel('catalog/product')->getCollection()
->addAttributeToSelect('*') // select all attributes
->setPageSize(5000) // limit number of results returned
->setCurPage(1); // set the offset (useful for pagination)

// we iterate through the list of products to get attribute values
foreach ($collection as $product) {
//customer group id 1 price as follows:
	$product->setCustomerGroupId(1);
  echo $product->getSku();
  echo ',';
  echo (float) $product->getFinalPrice(); //get price as cast to float
  echo '<br />';
}