I just found out that Lulu has selected Prime Requisite Games adventures to be distributed on Amazon through lulupress.
The downside is that there is a markup in price through Amazon* (while the price on the Lulu site will remain the same).
The upside is that any type of distribution isn't a bad thing, especially with old-school RPG adventures.
*EDIT: Lulu removed the 30% markup in price. Now we have equal pricing on both Lulu and Amazon.