Lexis-Nexis can be difficult to navigate, but it has a wealth of legal material, including most published court cases in the U.S., statutes, and law review articles. From the opening screen, click on Search by Content Type to get to the law area.
Lexis-Nexis is probably best used as a last resort in looking for a case or statute. Although it has more content than any free website, its opaque structure makes it user-unfriendly.