K's Arcade eBay Store - Items include closeouts, manuals, seconds.
Mr. Pinball - Pinball classifieds, repair tips, game registry.
Internet Pinball Database - Searchable database of all pinball games ever made.
Nick's Jukebox Repair - Jukebox repair.
Great Plains Electronics - Electronic components.
Mouser Electronics - Electronic components.
This Old Pinball Repair & Restoration - Pinball repair guide.
edcheung.com - Personal friend and pinball enthusiast.
Gameroommagazine.com - GameRoom Magazine.
Pingamejournal.com - Pingame Journal magazine.
Flippers.be - An informative hobbyist pinball site in Belgium.
Arcade Novelties - Officially licensed pinball t-shirts, apparel & gift items.