You should be happy that you have such a financially aware IT dept. The machines are truly expensive and after managing a farm of 150 Mac minis at work I can tell why.
It is like 3 days running the EC2 buys you a Mac mini? And you can only rent the machine in day increments
So I asked the IT dept and they said it's stupidly expensive to run a MacOS instance on EC2, and that they would just send me a Macbook Pro instead.
I wish I were kidding.