https://www.youtube.com/watch?v=vDIz8WY6zLE
This came up on my Youtube feed and it looks like a really slick option for MiSTer. If I understand the video correctly, for around $200 you can get a board that has all the common MiSTer addons. I believe that you have to also purchase a DE-10 nano on top of that. I also believe the case will be open source and you will have to get it 3D printed on your own. They hope this will go on sale in October or sooner.
Their board includes:
-Power switch
-2 navigation switches
-4 front USB ports
-2 back USB ports
-Internal USB headers
-SNAC port (for native accessory addons such as controllers)
-3.5mm audio input (for loading cassette tape games)
-1 microSD slot
-expansion port for other addons
-128M RAM (removable for possible future RAM expansion)
-HDMI out
-VGA out
-SCART out
-SPDIF out
-3.5mm audio out
-Sync-on-green switch
-ethernet port