[ATDrake]

Bargain @ $1.99 at most Canada & US retailers (couponable @ Kobo Canada using the 50SUN 50% off unlimited use coupon good through Monday), some true crime accounts from Steerforth Press and Sourcebooks:

• The Shooting Salvationist: J. Frank Norris and the Murder Trial that Captivated America, about a church murder apparently performed by a charismatic fundamentalist preacher in the 1920s (Wikipedia)
• The Paradiso Files: Boston's Unknown Serial Killer, making the case against a potential suspect for unsolved crimes in the Boston area
• The Killer Book of Infamous Murders: Incredible Stories, Facts, and Trivia from the World's Most Notorious Murders by Tom & Michael Philbin, Exactly What It Says In The Title
• The Killer Book of True Crime
• The Killer Book of Cold Cases
• The Killer Book of Serial Killers

Not particularly crime-related, but also marked down to $1.99 and couponable from Skyhorse/Arcade publishing:

• Dr. Feelgood: The Shocking Story of the Doctor Who May Have Changed History by Treating and Drugging JFK, Marilyn, Elvis, and Other Prominent Figures, interestingly enough, co-written by a UFOlogist with his own Wikipedia page
• Sinatra and the Jack Pack: The Extraordinary Friendship between Frank Sinatra and John F. Kennedy-Why They Bonded and What Went Wrong
• The Guardian of Mercy: How an Extraordinary Painting by Caravaggio Changed an Ordinary Life Today
• @ $2.99 George Washington's Surprise Attack: A New Look at the Battle That Decided the Fate of America