The Darkness Inside is now available for preorder on Amazon for download on Oct 10. While it may currently state .99c, it should be price matched to $0 by the time its released. If I understand the preorder system, it should give the purchaser the lowest price by the time its available ($0).
On a related note, in about six months, optimistically, my books on Amazon will be briefly taken down. I will be shifting over to another, unused KDP account to also publish non fiction works under my real name. For the enduser, everything will still be separate. One “author” will not be connected with the other outside KDP. Though theoretically possible, you really can’t have two active KDP accounts, because issues relating to taxes may arise. If we’re lucky, The complete Tome of Passions will be available before then!