Am not sure if there is a lot of affiliate companies for Saas product. But what I have observed the trend for saas tools is submitting your tool to the Tools Aggregate site and review sites.
On G2Crowd >https://www.g2crowd.com/products/new#!
You can submit your product, so when the potential people is looking for other tools, your tools will be shown next to them. It is the same concept of a similar product or Competitor products.
A marketer most of the time go to review sites or site which offer an alternative list of products to FIND what else is available. So this way your product can get exposure.
Lets see what other people got to say here.