£0.99-ish sale at Amazon.co.uk for several excellent and/or intriguing young adult SFF novels.
These I've read and would recommend:
Diana Wynne Jones - Howl's Moving Castle
https://www.amazon.co.uk/dp/B009YBTZ8O
Diana Wynne Jones - The Game
https://www.amazon.co.uk/dp/B002RI9F4K
C.S. Lewis - The Lion, the Witch and the Wardrobe
https://www.amazon.co.uk/gp/product/B002UZ5J72/
Jonathan Maberry - Rot and Ruin (Rot & Ruin Series #1)
https://www.amazon.co.uk/dp/B004K1E4X4
Jonathan Maberry - Dust and Decay (Rot & Ruin Series #2)
https://www.amazon.co.uk/dp/B005H2HOCS
Maggie Stiefvater - Shiver (Wolves of Mercy Falls #1) £1.09
https://www.amazon.co.uk/dp/B005HPMB6Y
Maggie Stiefvater - The Raven Boys (Raven Cycle #1) £1.09
https://www.amazon.co.uk/dp/B009CWF39U
I haven't read these, but they've gotten good buzz:
Renée Ahdieh - The Wrath and the Dawn
https://www.amazon.co.uk/dp/B01MQKMN1R
Rachel Caine - Ink and Bone (Great Library #1) £1.09
https://www.amazon.co.uk/gp/product/B00UEXOU2M/
Rachel Caine - Paper and Fire (Great Library #2)
https://www.amazon.co.uk/gp/product/B01E5LHEPI/
Chelsea M. Campbell - Dragonbound
https://www.amazon.co.uk/dp/B01AUH9N3C/
Michael Grant - Hunger (Gone Series #2)
https://www.amazon.co.uk/dp/B002AP9G8K
Ryan Graudin - Wolf by Wolf
https://www.amazon.co.uk/dp/B011ALLVC8
Gregory Maguire - After Alice
https://www.amazon.co.uk/dp/B00V3KJXZE
Chuck Wendig - Atlanta Burns
https://www.amazon.co.uk/gp/product/B00LAE5DKW/