You won't, not really.
I can find chicken on sale for 99 cents a lb. Now if i shop for organically raised pastured chicken it can be $3-$5 a lb, but unless you're already shelling out for prenimum meat, it won't save money. Now most meaties for family use are raised in groups of 25-50, and because of the various flaws in the cornish crosses, need be be butched all at once and stored (if you already have a vaccumm sealer and chest freezer, great, if not much of your hard work can be freezer burned). not saying don't raise your own, I do it, and many others do too, but once you add up costs of chicks, high protien feed, feeders, waterers, run space... it's not as cheap as it sounds. You'd have to raise them for years to get back those start-up costs.