Hotel Accommodation Booking Deals

I am looking for hotels to stay for travelling in mid April so I am searching for good hotel booking deals.
I know we used to have some good discount codes previously but those sites are now long gone. What are the good website to book hotel stay in China and Japan now?
Booking.com used to do cash back deals but I don't see the new promotions. Is there any other website doing promotions these days on hotel booking?