I am looking for a cheap SBC with two switched Ethernet ports for a network device project. It is incredible how rare SBCs that have just two Ethernet ports (without a kitchen sink of other stuff) are.
I have experience with PC engines boards in the past. They are good quality but the price is about 5 times what I am looking for, e.g. something about $20-30 to build a competitive network appliance with.
https://www.aliexpress.com/store/product/Orange-Pi-R1-H2-256...
http://www.orangepi.org/OrangePiR1/
Depending on what you need, a readily available appliance at a reasonable price (~$100) might even be better than just a SBC.
[1] https://www.openbsd.org/octeon.html
[2] https://www.ubnt.com/edgemax/edgerouter-lite/
[1] http://www.fli4l.de/en/home/whats-that-fli4l/
[2] http://www.pcengines.ch/alix.htm