Amazon
Kobo
Some of the ones that are $4.99 at Amazon are $4.39 at Kobo and allow coupons. (Bargainmoose40 is still working for 40% off.)
Genres include mystery, horror, romance, fantasy, general fiction, historical fiction.
Unknown if this is a sale or price reduction.
Of possible interest to horror fans - some Graham Masterton and Sarah Rayne.