X-link to the Mystery/Thriller megathread for a sale with some true crime titles:
Through November 30th, Kobo UK is holding a sale on Historical Mysteries under £2.99, with a handful of true crime and crime-related history titles, mostly at the £0.99-£1.99 mark. There's Lady Jane Grey, assorted serial killers, WWII spies and coverups and more, from publishers including HarperCollins and smaller specialty press.