Now, I'm not saying that bigger budget short films suck, nor am I saying that a zero-budget film is better; it of course comes down to talent, luck, script, etc etc. But the way I look at it is: if your film is going to suck anyway, you're better off doing it for $5 than $5,000. I've made some TERRIBLE short films, but have been lucky enough in that they only cost me about ten coffees to make.
So you need locations. Locations can cost $1000, or they can cost nothing. And it's entirely up to you. You can say "I would like to film in your Doctor's surgery, how much does it cost?" or you can say -- "I am a young, upcoming film director and I would love to shoot in your surgery. I've been coming here since I was three years old, it's a part of my life and I'd love for it to be in my film. I'm doing this film on a zero-budget, using actors and friends from our community to help out. Would we be able to film in your surgery? It would only take one evening, we can do it after you close."
And then people begin to open up, they begin to see your passion for the project and they realise they can be a part of making movie magic happen.