Journal articles are usually found online. Some of them will only be held physically in the library.
With regard to both textbooks and cases/texts, Westlaw now houses many of these with their new updates. It should be noted previously Westlaw only contained seminal textbooks like Chitty, Benjamin and Snell -- which are leading texts practitioners and others use. They tend to go into a lot of detail and are quoted by judges -- even their footnotes are deferred to in judgements. Now you get some ordinary textbooks which are designed for undegrad law students, so you might not need to buy a textbook. They even contain text/cases books.