i just use a php redirect script and if you provide enough content on the page and you place the link correctly you get direct affiliate links indexed on google.
Code:
<?php
header( 'Location: http://yourafflink.com/12345' ) ;
?>
Copy that code and place in notepad name it whatever you like. Lets say you named it afflink.php <<<<its going to need a php extentsion for it to work save the file as all files not a txt file.
you can upload in a link directory or on the the main public.html folder....
then just make your affiliate link on your site like these hXXp://yoursite.c0m/afflink.php or hXXp://yoursite.c0m/links/afflink.php or the name of the directory the afflink is in.
Its a old trick but it works for me. You can even stuff cookies with this script but you need to add more code to it.