I have about 50 timothy bales in the barn. And... maybe 5 timothy/orchard grass bales (our neighbors just baled their field and want to know if our horses like their hay... I hope they do!)
The timothy bales were $5.50. We picked up.
Our neighbors charge $4.50 delivered, so since we're across the street it should be prettttty cheap.
The only horses that got straight alfalfa at the barn where I used to board were the broodmares. And only a few weeks before foaling and until the foal was weaned. The weanlings/yearlings also get some along with their regular hay.