Ok, since Sony readers are split up over multiple forums, and likely to be split to be even more, I'm posting this here. Sorry non-Sony users!
Basically, the idea is to have a list of books that are currently free, or less than one dollar, at Sony's Library. Kindle users have something similar going, so, why not those with Sony?
Now, this will take all of us to update, so people if you see something that is free, post it. If it is no longer free, post it. Mods and admins, feel free to update the original post if you want.
This list is also in the wiki over at
https://wiki.mobileread.com/wiki/Free_eBooks_(Sony)
Free
Assassin's Apprentice by Robin Hobb
The Briar King by Greg Keyes
Blood Engines by TA Pratt
The Brass Bed by Jennifer Stevenson
His Majesty's Dragon by Naomi Novik
Maximum Ride By James Patterson
Paranoia by Joesph Finder
Queen of the Orcs: King's Property by Morgan Howell
Red Mars by Kim Stanley Robinson
Serial by Jack Kilborn
Star Wars: Lost Tribe of the Sith - Precipice by John Jackson Miller
Star Wars: Lost Tribe of the Sith - Skyborn by John Jackson Miller
Romance
Darkfever by Karen Marie Moning
Kiss of Midnight by Lara Adrian
Kiss me Deadly by Michelle Hauf
Slow Hands by Leslie Kelly
His Lady Mistress by Elizabeth Rolls
Irresistible Forces by Brenda Jackson
Price of Passion by Susan Napier
The Bride's Baby by Liz Fielding
Snow Bound by Janice Kay Johnson
99 cents or less