I'm a graphic designer and have customers that want things printed for them. I've been working with James over at StickerTitans for about four years now. I send him the art work and he prints and ships blind, so my customers don't know that it's coming from them.
A great way for me to make a living working from home.
Tip for consumers: If you don't have a good file, StickerTItans will let you know. This means you don't wind up having a blurry sign.