A pre-holiday discount sale is on now for each of the books. They will or are available for 99 cents each, a reduction from the ridiculously low price of $2.99. This make take a few days to be effective.
Oh, I just looked and the Origin of Homo Optimus is now available on Barnes & Noble. Thus, the new book is now selling on my biggest three distribution channels, i.e. Apple, Amazon and Barnes & Noble ('though at $2.99 for the next few days).