I recommend giving us a little more information like the nature of the sign; business or building name? Do you want a local artist or a chain sign store?
If you’re looking for local, the stand out icon of West Seattle is Sign Savant aka Jaffe Witte. I’m a design geek. This guy is a master of old school sign making. His work is everywhere in Seattle.
Gallery
If you want quicker Vinyl Cutter stuff, I’ve used Zebra Print & Copy. Really nice folks that will listen & help. 35th & Fauntleroy.