Generic comments about a hays suitability or lack thereof have no basis in a feeding program! You need a forage test to determine if the hay is good or bad for your paticular needs. Legume hay - ie, soybean hay, peanut hay, alfalfa, clover, pea, can all be good to excellent - they can also be poor to pathetic. A forage test will tell you.
A good price on a product comes from
1. Inferior Product
2. Ignorant Seller
3. Desperate Seller
4. Lack of demand for product
Find out why the hay is cheaper and that will tell you a lot about the nature of the product.