UPDATE: the preordering is over and it's now best to approach this through the main page, https://www.audible.com/ep/audibl...er-benefit
. I see two additional books not listed here, so if you managed to preorder all of the ones we listed here, you get the whole set for free; and one of those two was actually free before. So... stay alert, and let's do this again next month.
Let's begin collecting the free preorders for September's Audible Originals benefit. As previously, these are books that currently show up as free preorders, and if all goes as it has in the past, they will change to costing money on the first Friday of the month, and paid subscribers will be able to add two for free.
So click'em here first, preorder, and then -- if all goes well -- you get to choose the two they didn't provide as preorders (OK, there were three last month; still pretty slick).
(hat tip to XyKo)
As usual with audible, paid membership required.