Ask HN: Cheapest edge device to run real-time object detection or face detection

Typical answers include Raspberry Pi 3, Jetson TX2 and now upcoming ones such as AWS DeepLens and Google Vision Kit. Any other ones tho?

I've already played with RPi3, it's too slow and for the TX2, it's decent (10 FPS) but the form factor is way off. I'm looking for something that I can build up from the ground up, kind of like the Google Vision Kit.