One of my favorite organizations is Breast Cancer Action, which is also a member of the Prescription Access Litigation coalition. (See previous PAL blog posts about them here. They are the brilliant and creative people behind the Think Before You Pink campaign.)
The good folks at Breast Cancer Action have just published a guide to drug companies' Patient Assistance Programs that offer free or discounted breast cancer drugs:
Many pharmaceutical companies offer Patient Assistance Programs to help cover the cost of treatment. To make this information more readily available, BCA has compiled and posted information about manufacturers' Patient Assistance Programs for drugs commonly prescribed to breast cancer patients. Click on the brand, generic, or manufacturer name to learn more about the specific program. Please note that they have varying eligibility requirements, enrollment processes, and duration of assistance.