Preston, you can find wire at any of the industrial suppliers on line. MSC, ENCO, McMaster Carr etc. They sell steel, steel music wire, aluminum, brass and other types of wire.
Here is one example.
http://www.mcmaster.com/#aluminum/=3ruuoj
You have to know what you want for the application that you are working on. You can than select the type of wire you need and order some. Google is you friend.