Star Trek book deals (should be DRM free everywhere) good until September 30th. Can be bought directly from the publisher (linked) or your favorite retailer. The linked publisher site has links to other retailers. $1.99 each
Totality Series (TOS)
by William Shatner with Judith & Garfield Reeves-Stevens
Captain's Glory
Captain's Blood
Captain's Peril
The Dominion War Series (TNG/DS9)
Behind Enemy Lines by John Vornholt
Call to Arms by Diane Carey
Tunnel Through the Stars by John Vornholt
Sacrifice of Angels by Diane Carey