There's a lot of problems here and you should take a step back and re-evaluate.
-I don't understand your price comparisons. You can order frozen rats for $1.25 also...just check out any one of the hundreds of frozen rodent suppliers.
-Chicks are not cleaner then rats. I breed rats and I breed chickens. My chickens are free range and still get fairly dirty. Chickens from a factory are cesspools of decay.
-Finally, we know ball pythons can survive in captivity on a diet of rats or mice and thrive. While they do eat birds in the wild, birds make up just a fraction of their varied diet. You have absolutely no idea if they can thrive on a diet of solely chicks. I'm guessing they won't and this isn't a good idea.
Getting your snake fat is not a good idea either. Work on steady body gain now with appropriate feedings of rats or mice and you'll have a healthy snake.