I decided to check offerings and product quality of OSH Park, a PCB manufacturer from the US. I’ve ordered three PCBs of MBAVR-4 (order costs – 10$, shipping costs – 14$). I had to wait 4 weeks for UPS as it had to be delivered to Poland, where I live, but it was worth the wait. The price as for prototype PCB is very good and the quality of shiny purple printed boards is impressive. OSH Park goes to my list of “Highly recommended!”.
Project is open and can be found here – https://oshpark.com/profiles/lpodkalicki