Tornado Terry's - Offers supplies and parts for arcade machines. Located in Texas, United States. - http://tornadoterrys.com/surplus.htm
Space Invaders Parts and Repairs - Source of parts and repair services for a variety of arcade games. Deals specifically with Space Invaders and similar vintage games. Located in Ohio, United States. - http://www.elektronforge.com
Arcadeshop Amusements - A source for parts. Includes pictures. - http://www.arcadeshop.com