http://www.pparx.org/
That links to the Partnership for Prescription Assistance. They are a non-profit clearinghouse that matches patients up with the various programs available. They are big time and cover over 2500 different drugs. They will prequalify you with a few questions. They got me free Requip for the last six months. No program for sinemet at the time. It's a one stop shop and a great help.