Shop the rest. Primary Law verges on being a commodity. Save money on it to buy the value-added secondary law you need. Using more than one vendor is a minor inconvenience compared to the cost savings. It is not always easy.
Habit runs deep.
The grizzled partner who has been there since whenever only reads tan and red books. Never sacrifice accuracy, completeness or currency in your quest to save money. One malpractice suit will make any savings a paltry false economy. I wonder how some free Web databases can afford to stay current. There is no free lunch.