Today’s Big Deal at Kindle UK is thirteen Penguin Modern Classics books, with a decided bent towards mystery/spy/thriller titles, for £0.99 each. I’m travelling right now and don’t have time to figure out a Kobo UK link, but I spot checked five of these books and all were also on sale at Kobo UK.
And FWIW, I love love love the Chandler cover!
Note: At least one of these (the Tey book), and possibly more, may be public domain for you depending on where you are/live right now, so check before you buy.
Find the books at the Kindle UK Big Deal page