This is AWESOME! I definitely have to build this some day, maybe when I'm in the mood to suffer through all that soldering. I don't mind the small screen for reading novels, but a text book or PDF probably won't happen.

Also, I noticed that the price for components went up from the ~$30 mentioned in the instructions to $50+ on Digikey, and there is currently one part that is out of stock (and no back order allowed).

Total cost: $15 (PCB) + ~$55 (components) + $15 (display) = ~$85. With shipping it may be more like $100.

But $100 for an open, hackable e-ink eBook reader is still pretty good IMO.