It says:

By the USPSTF's estimates, it takes 1,904 women in their 40s being screened for a decade to save the life of one woman whose cancer would have gone undetected. As science journalist Merrill Goozner observes, that means that it costs as much as $20 million – not counting the interventions for false-positive results – for every life saved by regular mammograms for women in their 40s.

That's 19,040 mammograms for $20m, or about $1000/mammogram. Which is wrong. Mammograms cost about $100 for the uninsured.