We routinely get calls from attorneys who are looking to get rid of law books. They may be retiring or downsizing. The answer has evolved, but it is generally harder to find a home for law books now than in the past.
The first recommendation we make is to post on email lists for other lawyers. The Oregon State Bar’s section email lists can be a great way to find a newer attorney looking to make their office look lawyerly, or build a law library.
We have referred people to The Lawbook Exchange, an east coast company that specializes in used law books. Another large used book vender, although it doesn’t specialize in law, is Better World Books. One can also check with local used book stores, or possibly antique dealers for older books.