I worked for a solo practitioner for a few months and she had a Lexis rep come in an pitch her to get her to leave Westlaw. A subscription with unlimited access to cases in the state she practiced in and unlimited Federal was just under $500/month. That also included unlimited access to law journals, but no other secondary sources (treatises, etc.). Her Westlaw subscription was close to $600/month. The price is heavily dependent on the number of users, too. The guy had a grid with him that showed the unlimited prices for varying numbers of attorneys in the office. It would have been about 80% more for a second attorney.