Hardkernel have the ODROID-C2 in beta for a release in two days' time for 40USD - http://forum.odroid.com/viewtopic.php?f=135&t=18683
Compared to the RPi3, this extra 5USD gets you gigabit ethernet, 2GB DDR3, higher clock speed, and HDMI 2.0 capable of 4K60.