There are many resources for fabric... look to relatives for clothing they want to discard. Often once "word" gets out you are looking for fabric.. it just starts coming. If you have a church you attend post a notice that you are looking for fabric. even the ugly fabric can contribute to a beatuiful quilt if you use small enough pieces.
Don't quit.... just get word out you are looking for fabric.. perhaps on freecycle in your area or even Craigs List. It would also help to find a quilting buddy to get you over the methods which you may be unfamiliar .