While in law school, you have been lucky to have unlimited access to Westlaw and LexisNexis without having to worry about the cost. Non-academic employers rarely have this kind of unlimited access. Both are amazingly rich resources but they are also expensive. Searches in Westlaw can range any where from $0 to $100's per search!
It is this expense that makes it so important to know about low-cost and free sources for the law.