Ask HN: What are my options to host a 10-20TB Postgresql server on the cheap?

The obvious answer is Amazon but was wondering if there are cheaper options. I've thought about using Backblaze B2 Cloud Storage (.005/GB storage + .05/GB transfer out). That would only host the actual data without the server but I'm not sure it would work if I need on-demand access to it. Are there any other options?