If your SaaS is self-service, consider running some experiments in Google AdWords. You're going to want to target keywords searching for your solution or describing the problem. These are users with intent, so you should be able to convert a small % of them if your solution solves their problem.

If your product requires a meeting and demo to convince someone to sign up and give you $19, consider how you can convey the messaging from the meeting and demo in your website marketing (e.g demo video, trial version etc), so you can try more scalable approaches like AdWords.