Lord Patrek

Frank Herbert's Dune Messiah is 1.99$ on Kindle (Canada and USA). David Walton's The Genius Plague is 1.99$ on Kindle (US only).

Delilah S. Dawson and Kevin Hearne's Kill the Farm Boy is 2.99$ on Kindle (US only).

GRRM's Nightflyers and Other Stories is 2.99$ on Kindle (USA and Canada).

Joel Shepherd's excellent Crossover is 1.99$ on Kindle.

Ian McDonald's Time Was is 3.99$ on Kindle (Canada and USA).

The first three volumes of the Fractured Europe series by Dave Hutchinson (Europe in Autumn, Europe at Midnight, and Europe in Winter) are 0.99$ each on Kindle (Canada, USA, UK).

Terry Pratchett's Going Postal is 1.99$ on Kindle (US only).

Adrian Tchaikovsky's Redemption's Blade is 0.99$ on Kindle (USA and Canada). Sebastien de Castell's Spellslinger is 4.99$ on Kindle (US only).

I did as well! Ian Cameron Esslemont's Dancer's Lament is 2.99$ on Kindle (US only).

Iain M. Banks' The Player of Games is 2.99$ on Kindle.

Today only, N. K. Jemisin's How Long 'til Black Future Month is 4.99$ on Kindle (USA and Canada).

Ernest Cline's Ready Player One is 2.99$ on Kindle (USA and Canada). Terry Brooks' Street Freaks is 4.99$ on Kindle (US only).

Guy Gavriel Kay's Sarantine Mosaic. Also, though not officially a duology but set in the same universe but years apart, Kay's Under Heaven and River of Stars.

Anne McCaffrey's The Dragonriders of Pern, an omnibus comprised of Dragonflight, Dragonquest, and The White Dragon, is 2.99$ on Kindle.

Yoon Ha Lee's Ninefox Gambit and its two sequels are 0.99$ each on Kindle.