First things first. You are shooting a short film. Obviously its not a commercial project and there would be a lot of people who would want to shoot a short film or edit it or just play a role in it. FOR FREE.
Let me know where you are from and your location. I will check if i know someone there who can help you out with the stuff. Even if they have a camera with good lenses, it will reduce the budget.
feel free to connect with me on facebook and discuss.