Wow. Sounds like you may have painted yourself into a corner. Follow the advice of everyone here.
I would also suggest thinking outside of the box. Right now my nephew is selling ice cold water by the roadside. He buys 24 waters for about $5.00 and sells them for $1.00 each. With the profit from his first case load sale he purchased another case of water and some hots dogs and buns and a portable grill. Now he is selling hot dogs and water. The kids in the neighborhood love it and so does there mom.
You may want to consider having something like a bake sale. Baby sitting is always good too. Perhaps you could wash cars. In the mornings my nephew goes to a local garage where he washes cars and in the afternoons he sells water and hot dogs.
There are loads of things that people do everyday that you could do and get paid for. What talents, skills and abilities do you possess and then let your network of family and friends know you are offering your services for hire.
I don't know how much time you have to get this done but at least you have $20.00 seed money to poor into it. I hope this helps.