Below are some arcade-related pages and sites I found interesting or useful:
https://forums.arcade-museum.com
The KLOV forums are a great place to find all sorts of info for collecting, restoring, repairing, and playing your classic arcade games and other coinop goodies.
https://tntamusements.com/
TNT Amusement in Southhampton, PA is a dealer of all things arcade games. You can buy newly refurbished games, occasionally some parts, and check out Todd’s video blog on Youtube as well!
https://www.quarterarcade.com
Quarterarcade is another PA company that deals primarily in parts for arcade games. Their site is extremely organized and he carries both used and new parts.
http://www.brentradio.com/
BrentRadio’s arcade page has tons of cool info and pics, not the least of which is the large collection of Space Invaders information, schematics, and other stuff!
http://arcarc.xmission.com/
MASSIVE and AMAZING Archive of manuals, reference material, technical information, pictures, and other information regarding arcade games.