Yellowface by Rebecca F. Kuang (= R. F. Kuang) is £0.99 at Amazon UK and Kobo UK.
In the past couple of weeks this book has gone from £7.99 to £4.99 and now to £0.99.
https://www.amazon.co.uk/Yellowface-...dp/B0B4BTBKB7/
https://www.kobo.com/gb/en/ebook/yellowface-1