Well, kiddo, there are these ancient things... they called em "books" (heh, couldn't resist). But seriously, used bookstores and the library are a great start

Well, kiddo, there are these ancient things... they called em "books" (heh, couldn't resist). But seriously, used bookstores and the library are a great start look for classics such as Knuth Art of Computer Programming. Also check with the college course catalogs and see what CS classes are using as textbooks.