Step 1:
Create New CMS Page in Below Content Add.
{{block type="catalog/product_outofstock" template="catalog/product/list.phtml" column_count="4"}}
Step 2 :
Create New PHP File Below Path.
Example :- app/code/local/Mage/Catalog/Block/Product/Outofstock.php
Step 3 :
OutofStock.php...