[samscully]

Vast AI (https://vast.ai) are good, 1x GTX 1080 comes to about $170/month. You are charged by the hour unlike Hetzner.

There are obviously downsides to renting time from random individuals though, so it's not suitable for a server-like workload. Good for development notebooks or training.

[gwern]

I recently used Vast.ai for ~3 weeks to run an anime BigGAN ( https://www.gwern.net/Faces#biggan ) and the stability/uptime was pretty much 100%: it never went down or caused problems. (I had problems, but they were all due to the BigGAN.) As long as a little downtime isn't too big a deal or you can script changing instances (they have a CLI tool), you probably could run as a server.