Are U.S. savings bonds still a worthwhile investment? KPLU financial commentator Greg Heberlein thinks so. Even with all the government shutdown shenanigans in Washington, D.C., Greg says savings bonds are still one of the safest investments you can buy. In addition to safety, savings bonds are ideal for savers of modest means who need to sock a few dollars away each month. You can buy a savings bond for as little as $25.