Once you know the types of components that you need for your project, the next step is to find sources/vendors from which you can purchase the components (also known as sourcing parts).
Professional Distributors These distributors are often used by professionals in industry, and provide the most complete selection of different parts.
Adhesives & Tape Adhesives for Paper from ConservationWiki Electronic Grade Self-Leveling Silicone from American Sealants, Inc.
General Berg Grainger (* ASU Preferred Supplier) McMaster-Carr Miki Pulley MSC Industrial (* ASU Preferred Supplier) Motor System Parts from Radical RC Stock Drive Products Bearings igus - plastic bushings, bearings, linear guides, and cable carriers.