It takes less than a minute to go to their site and click
on "donating a mammogram" for free (pink window in the middle).
This doesn't cost you a thing.
What they don't tell you is that it takes about 45,000 clicks to provide one mamogram but this is not a hoax, the site gets about 53,000 clicks a day. They keep about 25% to keep the site running but they DO provide significant numbers of free mamograms. Also if you keep the web address you can click on the site more then once, you are only restricted from clicking more than once a day.
This link will take you to the National Ovarian Cancer Site with a wealth of information offered for you.