I don’t know how libraries work in the US. In germany most libraries are part of a network. They can get you any book, that one of the other libraries in the network have. You are not limited to what is available at the specific library. If its available in one of the many other libraries (like one of the big public state libraries) then you can get it. Though you might need to wait a bit.

For proxmox on a VPS beware: Some hosters are using a kind of virtualization, that is more like a container instead of a VM. This means, that if you need kernel access (like changing active modules) you will fail. Proxmox probably won’t run on such a VPS.

Also: A VPS is already virtualized. Running nested VMs (some VMs on your Proxmos VM/VPS) will hurt the performance. Better stick to containers on a VPS.