Contact your state council for the arts or a similar body for information on available grant money for writers, which may be as little as a few hundred dollars or up to several thousand dollars.
Members of the National Association of Memoir Writers have access to members-only grants, as well as other perks.
The National Endowment for the Humanities sponsors a number of grant programs your memoir would be a good fit for, particularly if the memoir revolves around an event of historical significance.
The NEA (National Endowment for the Arts) is another organization that provides grants to writers.
The Barbara Deming Memorial Fund may be a viable grant option for you if you are a woman and your memoir has a feminist point-of-view.