SparkFun À La Carte

Article note: That's an interesting offering. It's basically board-integration-as-a-service for anything built from SparkFun parts (including whole assemblies), for about $1k. They also offer a basic board foundry and population from their stocked components for your own design files starting at about $150. I'm not sure how big the market between "I can just do it and send it to a small run board house like OSHPark or PCBWay" and "I don't know what these words mean" is, but it's the only offering I know of in that space.