
As of October 2nd, the second "test print" of chapter one
and the first of chapter two have arrived.
and the first of chapter two have arrived.

I went with Ka-Blam digital printing for both runs.
They're cheap, but as could be expected, you get what you pay for. Page alignment, speed and overall print quality aren't the best with them. But again. They are VERY cheap. The cheapest print on demand company that I've yet to find. This makes them good for a printed proof to let me see if there's anything I missed, as well as readability. They also print at custom sizes, so it's printed at the size it's supposed to be.
For the first print run, I also got a copy from blurb. The quality of their prints is definitely better than Ka-Blam, with no visible banding in areas of solid color, and near perfect page alignment, but the price is considerably higher. Around three times more than Ka-Blam. Not to mention the inflexible pre-set sizes they print at. This makes them (at least in my opinion) impractical for use as a cheap proofing company. But really, they advertise themselves as more of a print-on-demand photography book company. At that they excel.
Blurb has also been my go-to company for producing DEAD in the e-book format. They give (for a limited time) free conversion of books made in their InDesign plugin, into fixed-format e-books. Fixed format means, the page contents stay in the same place on the page, when viewed in an e-reader such as an iPad or Kindle. This is something that is very time consuming and sort of confusing to do manually. So they're good for that too.