Love the idea of this. Had anyone found lesser $ hardware to do this?
Did find the HEGStudio open source software that was used in "The Bulletproof Life with Dave Asprey"
I don't think you're going to see cheap versions available for quite some time yet. The only units that currently exist afaik are all hand made by one person. I think I remember hearing the inventor say in an interview from a few years ago that he'd sold the patent (the device is called nir HEG if you want to research it) but I didn't hear to whom he sold it, or if it was going to be mass produced eventually or not. Unfortunately, I don't think the software is going to do you any good without this very specific device.
If you want a cheaper hack for training focus, you might try the foc.us headset or a CES device (both featured in the webinar). They don't do the same thing as the Upgraded Focus Trainer, but they're both affordable devices that Dave has said he uses.