My nephew is in the process of setting up a small computer supplies shop in HK/Shenzen so I'm hoping to be able to help him get the ball rolling and pick up some stuff to build a node. I'm attracted by SBC because of the small physical size but given the RAM requirements even the non raspi products are likely to get into US$50+ for the board alone. Given that price that leads me to considering some mini pc type product but they seem a bit overkill for a node setup. I have plenty of research to do.