Take a look at the majority of internet gurus. How do they promote their products and build their lists? Affiliates.
What are they doing for a month (or even longer) leading up to their big product launch? They’re promoting “content” and getting their affiliates to send over subscribers.
Build that list using free traffic where you only pay when a customer buys your product/service.
The key here is to create strong momentum coming into the launch…and having a high conversion system to pay your affiliates.