When searching for 'pager motors' I found these - they're tiny and operate at nice low voltages:
http://www.precisionmicrodrives.com/product_info.php?products_id=182
When searching for 'pager motors' I found these - they're tiny and operate at nice low voltages:
http://www.precisionmicrodrives.com/product_info.php?products_id=182