AMD High Performance 1 vCPU, 1024 MB RAM, 25 GB NVMe, 2.00 TB Transfer
Emails are sent using zoho mail free tier. If absolutely necessary an additional $2 for two users (admin and noreply) /month would be added.
Total cost (yearly): $96 + (some tax).
As things stand right now ~$100/year is easily affordable but as the number of users grow, it largely boils down to egress and storage costs. I can personally bear most of it, but if it starts booming then I'll have to rethink about options.
Currently we don't have anything setup (we're just too tiny right now). I'm talking to other instance admins about best practices around donations/tips.
I'm looking into Open Collective as the platform to accept donations at some point.
Just FYI the best deal for a vps I could find was a VPS S at contabo.com
For 5.99€ you get a 4vCPU, 8GB RAM machine with 32TB egress traffic, unlimited ingress included.
And if I understand it correctly, after 32TB you might just get throttled (I never scratched more than a few hundred MB). Ran a server there for 8 years, never had issues.
The management interface is a little old-school...
If you'd have to increase your vultr instance type, maybe a migration is also an option.
Their pricing and reputation is certainly good. However, it seems like they don't have simple full server snapshot support. I think that's mandatory at this point in case of potentially irrecoverable failures.