You don't need a tractor for roundbales. Get them lined up close to your pasture, tarp them, and feed off of them with a pitchfork. Get them set on their ends and they won't roll away. Here's a few sites I found, you can also place want ads on these.

http://www.hayexchange.com/tn.php

http://www.agrihayexchange.com/hay/haylistings.aspx?ltID=2&PID=102

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