http://www.needymeds.com/newuser.tml
There is a PILE of helpful information as well as access to, and instructions for, applications for free meds.
I found help with Lamictal here, which for now I get free. The income threshold to qualify for help from Glaxo-Smith-Kline is higher than most, and they offer help with more than one med. They ask for a copy of income tax returns to verify income claims.
My doctor's office found a program with Merck, and they supply free Zetia. That program is more generous than most as well - if someone goes over the financial threshold to qualify for help, they will accept a form signed by the PCP to attest to financial hardship because of medical and med costs.
The call-renewal number for GSK has a prompt for Medicare patients, so I'm guessing there is help for that group as well.
I hope this helps.
TCC