The following vendors are good places to go to purchase electronics for your Burning Man project.

Cool Neon

Electronic lighting shop in Oakland focused on providing lighting for Burning Man bound travelers. They have an extremely knowledgable staff who are very willing to help you plan and execute your project.

Adafruit

Premier hobbyist electronics store. Focuses on producing digital electronics for hobbyist/artists with detailed tutorials.

Jameco Electronics

Analog and digital electronics shop focusing on kits and the hobbyist community.

Newark Electronics

Wide selection of components for advanced projects.

Seeed Studio

Affordable reseller of digital electronics.

Sparkfun Electronics

Electronics for turning ideas into reality.