1. Older desktop hardware
Intel i5 4th & 6th Gen · RAM
Many hosts lease new enterprise servers and pass that cost on. We use older desktop processors, Intel Core i5 4th and 6th Gen (for example the i5-4570 and i5-6500), with DDR3/DDR4 RAM and SSDs.
These CPUs have good single-thread speed, which is what Minecraft and Rust servers, Discord bots and web apps lean on, and they cost far less than server hardware.