Fabulous Fantasies Lots of great gameroom items from old to new. Plus backglasses and restoration work. Unquestionably the most informative and comprehensive coin-op site on the internet. If you need to find something coin-op related, start here. GameRoom Magazine Great monthly periodical covering all aspects of the coin-op hobby.
Website has lots of stuff including subscription information.
Also includes lots of interesting facts about vintage amusements. Marvin's Marvelous Mechanical Museum One of my earliest influences for my penny arcade. If you are anywhere near Detroit, it's worth a visit. A great resource for all kinds of coin-op treasures, especially hard to find items. If John Papa can't find it, it probably doesn't exist.