0.99 USD, GBP, and Euro at various vendors (see below for links). For other currencies, some conversion (that may look all weird but should be equivalent to the 0.99 price point) will occur.
Primary Fault,
Book 1 of the Schattenreich*
Shaky Ground,
Book 2 of the Schattenreich
Amazon worldwide
iBooks
Nook
Kobo (through July 10th)
*Where's the Primary Fault link for Kobo? you might ask. A separate promo will run, starting next week, on Primary Fault. Stay tuned for details.
photo credit: Stillwater OK Fireworks-4 via photopin (license)