I just bought a Raspberry Pi 4 1 GB memory with aluminum case, aluminum NVME adapter, and a 64 GB SSD for about 80 euros. With microsd it’s even cheaper. 4 GB RAM would be about 120 euros.

The 1 GB RAM replaces one Forgejo runner that was in Hetzner. With €5 per month, I will earn this investment back in less than two years. After the price increase, this period will only shorten!

I also wrote about this at https://huijzer.xyz/posts/148/raspberry-pi-as-forgejo-runner