Hi,
I've done quite a few different stuffers some time ago, I still have some of the script ready to be replicated. That being said, there are of course many different techniques, and the issue is what the affiliate server tolerates and what they don't, how the cookies are set, how stealthy you want to be setting them etc.; of course factoring all those, the price and length necessary to code the suffer will differentiate.
Thus if you could provide a little more info about the affiliate server, what you want to achieve exactly, and if you have any technical information about the cookie setting process of the affiliate, or other restriction that you might need to bypass.
Thanks