Your best bet for generating a lower cost food is to mix your own by the ton. There are many formulas in the archives of BYC for creating healthy gamebird food.
Like someone else suggested feeding them chicken feed is substandard and honestly not humane for your birds. Chicken feed has nearly 10% less protein on the top of the fact it has too much calcium for quail roosters to consume regularly. Chicken feed has more than 3x the amount of infused calcium that gamebird feed does and can cause organ failure in your roosters.
Like someone else suggested feeding them chicken feed is substandard and honestly not humane for your birds. Chicken feed has nearly 10% less protein on the top of the fact it has too much calcium for quail roosters to consume regularly. Chicken feed has more than 3x the amount of infused calcium that gamebird feed does and can cause organ failure in your roosters.