Hi… The Basic tier is still the lowest one, as far as I know, but there’s been talk of introducing a “Broke tier” at roughly half that cost, eventually.
A credible self-managed Postgres cluster on Fly.io would cost ~$15/month, at ord prices, and that would come with occasional emergencies and a lot of up-front sysadmin learning, etc. So, there’s not a lot of room for lower-priced managed offerings on Fly.io, realistically…