Digital Ocean is like $5 a month. If that's too much money for you, then hosting at home is probably your best option. Downside is that you're going to spend all your time figuring out how to manage your own server.
And even cheaper is Amazon Lightsail starting at $3.50/mo, pretty hard to beat. I think for the amount of time spent managing a server and DNS things at home, these options may be more desirable.