snippet: colinmollenhour/adding-minimal-price-to-any-product-collection-in-magento

bestseller-minimal-price.php

<?php

/**
 * @see http://colin.mollenhour.com/2009/06/04/adding-minimal-price-to-any-product-collection-in-magento/
 */

/* 
 * example product collection:
 * $_products = Mage::getResourceModel('catalog/product_collection')->setStoreId($storeId); 
 */

$productIds = array_keys($_products->getItems());
$minimalPriceModel = Mage::getResourceModel('catalogindex/price');
$minimalPriceModel->setStoreId(Mage::app()->getStore()->getId());
$minimalPriceModel->setCustomerGroupId(Mage::getSingleton('customer/session')->getCustomerGroupId());
$minimalPrices = $minimalPriceModel->getMinimalPrices($productIds);
foreach ($minimalPrices as $row) {
    $item = $_products->getItemById($row['entity_id']);
    if ($item) {
        $item->setData('minimal_price', $row['value']);
        $item->setData('minimal_tax_class_id', $row['tax_class_id']);
    }
}