I bend my feed curve via free ranging a big pasture I've planted w/ varied things.  Seasonally dependent, it reduces my feed costs between 10% and maybe 35% peak pasture.
Most of my savings comes from buying from a local feed mill, via a family farms store who sells the mill's feed at near 0 markup as a leader.  I can buy from there cheaper than if I went to the mill directly, as I'm benefiting from the store's volume.
...and while I'm there, I almost inevitably pick up a new garden hose, or a yard tool, or a feed bowl, or some misc. plumbing parts, or stuff for electric fence maintenance, or...
Your local Ag Extension office should have some leads on where to get bulk feed at reasonable price, and your local Co-op may offer it as well.