Project afilate marketing low investment

I am looking to set up an affiliate marketing campaign on a budget of less than $100. My focus would primarily be on Cost Per Sale (CPS) marketing, and I do have a specific product or service in mind that I would like to promote. This project would involve setting up the infrastructure for a successful CPS campaign, and providing advice on the most effective ways to promote the product or service. I am looking to maximize the return on my investment and am open to any suggestions or creative ideas that could help me achieve this.