Been meaning to do this for a bit, particularly since the old BrokenPlotDevice.com website got kind of... ahem.... carjacked. And manhandled. There was significant manhandling. I won't go into it; that's a story for another time.
What I WILL go into is that NOW, the PDFs for all 4 books are now up on Gumroad for Pay-What-You-Want*. So you get to choose what 4 years of carefully crafted comics are worth to you (or what your wallet will allow you to indulge in), and in return you get four high-res PDFs you can take and read on whatever device that allows you to read PDFs.
So if you loved BPD and want to re-read the series without shelling out the cash or book shelf space for the book collection, OR if you want to try it out for the first time for a VERY low cost of entry, this is for you. Enjoy. :)
Books are, of course, still available in my shop! Though my stock is getting dangerously low on a few of them, and I'm not likely to reprint. So if you want any of the BPD books to complete your collection, I would advise not waiting too long.
* Ok, so there's actually a $1 minimum. The PDFs were free exclusively to my Patreon backers as a thank-you for supporting me in 2015. Still, $1 for the bundle isn't bad. That's, what, a quarter per year? IF you only pay the minimum? It's totally a steal.