(in their formatting, mind you — I’m not promising anything about the content): HeinOnline contains PDFs of articles formatted just as they are on paper, and that are thus much more readable than the Lexis or Westlaw versions. Its collection also covers all the issues of most journals; Lexis and Westlaw tend to go back only to the 1980s for most journals (though they include older issues of a few publications).
I know UCLA law school has a subscription, which anyone with a UCLA IP address can access without the need for any special logon id; I expect lots of other law schools have the same. If you do have access to a subscription, use it — you’ll never want to go back.