Is there any open source (DIY) hardware that goes with these APIs? Since $400 seems a little steep for a white screen I suspect it is possible to DIY similar hardware too. Any ideas?
This may interest you; might not be what you were asking for. I haven't built one, but keep an eye on it and dream of free time to surface mount solder and poke around with it. The repo used to have a cost estimate and think it came out to around $100 but my memory may be fuzzy.