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Have you thought about other hosters? Maybe try contabo.com or hetzner.com Should be a lot cheaper if you mainly need CPU power.

Unfortunately, this is mostly run on the GPU. Believe it or not, AWS was by far the cheapest.

Hetzner sometimes have GPU instances available on their auction site, and if you get in touch with them they can sometimes sort something out!

They used to sell them openly, but coin mining ruined that :(

Lambda Labs offers both on-demand and reserved instances that are much cheaper than other providers - https://lambdalabs.com/service/gpu-cloud/pricing