UC Business and Finance Bulletins are the policy statements for how the University does business. 

UCLA Purchasing Policies 

UCLA Policy 740: Purchasing Goods and Services  |  Attachment A  |  Attachment B
UCLA Policy 741: Low-Value Purchases (PDF)
New (searchable) UCOP Policy Library 
Guidelines on Industry Activities for the David Geffen School of Medicine at UCLA and UCLA Health

BUS Policy Series (Business Affairs, BUS-1 through BUS-79)

BUS-29: Equipment Management
BUS-43: Materiel Management (the key purchasing policy, driven by state law)
BUS-63: Insurance
BUS-79: Entertainment

Independent Contractor Guidelines

G Policy Series (General, G-1 through G-44)

G-28: Travel
G-39: Conflict of Interest
G-41: Gifts
G-42: Gifts Presented to Non-Employees 

Presidential Policies

08/19/82: Policy Regarding Employee-Vendor Relationships
Policy Regarding UC Contracting for Services
Contracting for Services Guidelines
Contracting for Services Formal Notice
Sustainable Practices Policy