Also, if you are interested in many different types of plastics in almost an infinite variety of sizes and thicknesses such as LEXAN, polycarbonate, PVC, DELRIN, polyethylene, and anything else including metals, and other raw materials, check out:
www.mcmaster.comNo minimum order, very inexpensive (unless you are buying expensive metals for your control panel or exotic plastics), and very fast delivery.
In the NJ/PA/NY area, order before 8pm EST, and receive item next day via standard ground UPS delivery
This site also has an infinite amount of other cabinet materials such as any type of hardware you can imagine, hinges, caster wheels, labels, tools, and everything else. McMaster is thee number one mechanical / material supplier in the United States.
Dan