Hey there nayeli,
I feed my birds a combination of barley sprouts, pakaged feed, and full time free range in pasture, vineyard, and compost bins. I sprout .75 lbs of barley each day. I WAS getting barley from the local feed store for apx 40 cents / pound, but more recently was able to get organic non-GMO barley for 35 cents / pound. It's from Bar Ale grains in California - but they only sell it in large quantities so you'd need to get together with some other farmers. I got 400 pounds which will do me for quite a while!
Contrary to some opinion, sprouted fodder is not more nutritious than the dry grain. In fact it loses a little in the sprouting. But as part of a full feeding regimen, it can help fill out the feed bill and help keep costs down. And my birds LOVE it.