Arcade Controls - It all starts here! You will find a tremendous wealth of information on this site. The forums are the best, in my opinion. Hundreds upon hundreds of great examples.
Ultimarc - Home of the I-Pac and the new Mini-pac! I use Ultimarc's products in all my controllers.
Emdkay.net - Can print standard and custom marquees. I have used his services a number of times with great results. Give him a try.
Lowes - I have lost count of the money I've spent at my two local stores.
Routerbits.com - They have great bits and fast delivery.
Retroblast - Kevin regularly reviews arcade-related products and includes industry news. He is a pleasure to communicate with.
X-Gaming- The home of the X-arcade. This control panel was the start of my arcade addiction.
CabinetParts- Sells Wilsonart laminate at reasonable prices. Very fast delivery.
Mike Trello's Blog- My technology Blog.