Better for outdoor storage than twine-wrapped bales.
Generally the most affordable "cow hay," often found for $20 to $45 per 4x5 or 5x6 round bale. hay-for-sale-in-oklahoma-craigslist
Based on recent market reports, prices vary significantly depending on the variety and quality (e.g., "horse quality" vs. "cow hay"): Better for outdoor storage than twine-wrapped bales