Probably I’d set it up as something like bid whatever for the book, but if it hit $N I’d eventually send you the second book, too, and at $Nx2 the 3rd, and $Nx4 the 4th & final book. Or something like that. Would that be appealing?
eta: Arright, there was enough interest on Facebook, at least, that I've set up an auction page. Read the instructions, it's slightly complicated, but your chance for not just this book but the whole series as I write them is posted here: Auction: A new CE Murphy novel!