You’re not likely to do that for $150. You might be able to pull an old Dell Precision T5500 tower with a weak Xeon on eBay for cheap and refit it with more ram, better CPU and cheap non-redundant storage for $200 - $250.

For sake of power requirements though, seriously consider your use case and needs. You can get by pretty well with cheap mini-PCs like Intel NUCs or AMD minis like Beelink for pretty cheap and just cluster them with something like Proxmox to scale out instead of up when you need additional resources. This will be reasonably priced and keep the power bill and noise levels down.