All of Locke and Key is on sale at Amazon. The first book is $0.99 and the next six are $1.99 a piece.
Locke and Key is Joe Hill's horror comic series about a family that moves in to a New England mansion left to them in a will and finds it is full of doors that do magical things.
A very good series. There's a Netflix adaptation that is also excellent, though season two has been on the way since forever. Hopefully this sale is due to Season two being on the way?
$13 for the whole series is a very good deal.