Heroku ~ $200 Intercom: $150 Amazon Web Services (S3, Route 53) < $10 SendGrid < $50 MailGun $60 Slack < $50 GitHub $50 BareMetrics: $29 ChurnBuster: $59 DNSimple: < $50 Evernote < $10 Gauges $6 Olark $49 Pingdom $10 Stripe(if you call it SaaS) 2.9% plus 30cent per transaction