Hello there!Are you looking for an entire Uno with USB port and all that with the pcb, or just the microcontroller and support circuitry?
Look through the OSHPark Sharing archive. Searching for "Arduino Barebone" comes up with boards like this one: https://oshpark.com/shared_projects/7WuQgkdZ
I do double-sided boards with plated through holes on real FR4)
septillion hear ya. Got a couple of those. I just like the barebone concept, building a very efficient arduino for my solar project at this point.