If you don't have some Raspberry Pi around, a Libre Computer Board AML-S905X-CC (Le Potato) 2GB 64-bit Mini Computer cost you $45 each. A cluster of 4 would be $200 hardware invest. I will discuss Azure pricing in the next part, but a club player/amateur would spend $20 per month.
The Raspberry Pi 3 and higher is built with a 64-bit chip. Yet the Raspberry Pi Foundation has only released 32bit Linux distributions so far but starting March 2022 there is a 64-bullseye distribution. Replacing my existing Pi's with Le Potato I switched to Ubuntu server 64-bit images. Performance is way higher than with 32-bit images.
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