ThisOldGame.com
ArcadeShop.com
PhoenixArcade.com

Parts:
HappControls.com
QuarterArcade.com
Mikesarcade.com
Centsibleamusements.com

Repairs:
Elektron Forge
Eldorado Games
ArcadeSolution.com

Information:
Crazykong.com
Coinop.org
Dragon's Lair Project

Fun Stuff:
Arcadetees.com