1 minute ago, PorkishPig said:
You're going to be hard pressed to find any reasonably priced Windows Server options for dedicated machines. The cheapest I could find was ~£85 from 1&1, but I cannot personally vouch for their services.
You might be best off looking at Azure AD if you're looking to use Active Directory, or AWS EC2 instances.
Actually found one! £48.95 and the windows OS is only £9.99 within my £60 budget.