No one has mentioned Heroku yet. Starting at $7 they are a bit more expensive than DigitalOcean, but with that extra $2 you'll get their platform, their tooling for deploying the app, their database backups. Adding other services later on is also easy with their addons. By choosing Heroku you can save hundreds or thousands of dollars in ops costs over a course of a few months. The hosting cost may go up quickly, but…
Heroku worked perfect for that. The $7/mo was fine.
Only reason I write this is because I wish there was a book of tech architecture case studies. What problem or business venture they were trying, what architecture they chose, how much it cost, how it worked out for them and what they wish they did.