Recent rulings can be found here:
Rulings and Legal Decisions
Below you can find access to the Customs Rulings Online Search System.
The system is a searchable database of a all rulings since 1989.
Visit this link for all rulings:
U.S. Customs and Border Protection Rulings
You can view the Valuation Encyclopedia here:
U.S. Customs and Border Protection Valuation Encyclopedia (1980 – 2015)