The Postal Service offers two semipostal stamps that help raise funds for important causes authorized by Congress. The Breast Cancer Research stamp was issued on July 29, 1998, and through 2015 has raised over $81 million for breast cancer research. The Save Vanishing Species stamp was issued on Sept. 30, 2011, and through 2015 has raised nearly $2.9 million to help protect threatened and vanishing species.