Which is the most economic option to host Strapi apps with PostgreSQL

Hi, I have 2 Strapi apps that use PostgreSQL as database. Till some days ago, I was using free dynos from Heroku to host them, but that is not possible anymore. So, now I’m looking for a new platform to host those apps. But, with a small search, I see the price to host a Strapi application, with a cluster of Postgre is about 20$ per month, and it is too expensive for me and my little apps.

Do you guys know some way or platform to host 2 or more Strapi apps, with Postgree cluster, spending the less money as possible? Like putting every in a container or something like that?