"The Design and Implementation of the Anykernel and Rump Kernels" is the definitive technical guide to the Rump Kernel ecosystem.
A print run of 50 was made for the first edition. Some copies were consumed by the university and some were given to early-day (ca. 2010) collaborators. The remaining five extra are now available for purchase; the open one in the picture is my personal copy. I will serial number them 46-50/50 (disclaimer: other copies are not numbered, but almost all are autographed out to someone -- "almost", because e.g. "to the university library, best wishes, [signature]" isn't a thing).
The price for private persons is 189EUR plus the expenses from your choice of regular, registered or courier mail. Contact to arrange for details; indicate if you want an autograph plus the shipping method and country.
While the price might seem high, the potential total will still add up to less than the printing run cost. If you're not interested in a rare hardcopy NFT, you can download the pdf and create as many fungible tokens out of it as you please.
The second edition of the book is unfortunately currently "out of print". Please check back later.
If you find the book useful, you are welcome to show your appreciation by donating a sum of your choice to the author via the link above. If you have a hard time choosing a sum, the suggestion is half of what you paid for the previous tech book you bought.