One of the most difficult thing in a SaaS is reaching to a customer in a cost-effective manner. It's common nowadays to have a CAC of $100+. So paid acquisition channels would be impossible if your prices are low.
If you already have a community or a user-base, then probably you can make a few hundred dollars out of it. But if you are starting from scratch, I would rather suggest going for a big idea instead of a smaller one because your marketing efforts in both the case would be almost same.
I agree that if you're trying to build a big business, you need to think hard about how you're going to get customers. But if you're just trying to make a couple hundred a month (as OP asked), it's a completely different ballgame. You just need a tiny sliver of an enormous pie.
Edit: To expand on my reasoning, don’t make it hard for people to contact you. There’s no reason to be afraid of spurious email contacts. They’re easy to mark as spam and ignore future contacts.
When have you seen people obfuscate their public social media contact addresses? I haven’t seen anyone hide their Twitter, FB public pages, or LinkedIn addresses. Email shouldn’t be any different for general contact purposes.
Now the one exception I have is work email addresses. I don’t publicize those.
You never know what someone might do with that information I guess :)
Nothing wrong with being free. It can get you popularity like dropbox, robinhood etc
1. Find a popular SaaS product. Like Intercom, Algolia, Segment. Make sure it doesn't have a free plan. This guarantees there's a market for the tool. Check out GetLatka for ideas. https://getlatka.com
2. Build your own take on the product. Find the minimum set of features that make it valuable. 10% of the work for 80% of the value.
3. Sell it at a 50-90% discount. There will be price sensitive customers that want the popular product, but don't want to or can't afford it.
4. Target bottom of funnel marketing channels: Targeted quora questions. Paid/organic search queries. Set up retargeting ads on Facebook. Product hunt launch it. That should get you a steady stream of customers.
I don't think this is a great way to build a million dollar business, but is a very easy way to make a few hundred. Shoot me an email if I can be helpful.