Help me not be homeless

I'm here in Missouri now! Have an interview on Tuesday for a job. But i have one small issue. Finding a place to live. Most places want you to be at a job for at least 3 months before they'll rent to you. I found a room that I can rent for one month but I don't have the intial deposit of 300. If anyone would be willing or able to help that would be great! Otherwise I will continue living in my car.