A guy at our makerspace 3d-printed a prosthetic hand and controlled 1 motor using a NeuroSky MindWave Mobile BrainWave Starter Kit that is around $80.
https://www.amazon.com/NeuroSky-MindWave-Mobile-BrainWave-Starter/dp/B00B8BF4EM/
Picture:
http://i.imgur.com/x7AlkEr.jpg
He did use a arduino with a HC05 bluetooth module. The HC06 won't work, cuz it's a "slave only" device.
When I started I was recommended Psychophysiological Recording but that's more general and covers ECG, respiration etc.
Possibly Rhythms of the Brain for background on frequency measures.
I'm not sure what would be good as a general EEG background. If I think of anything I'll let you know.