It would appear that the EA Store isn't going to let Steam have all the fun with discounts this week Dead Space 1 and 2 are now $11.99 and $23.99 respectively. The deal ends 5/8/11 so Sunday, but you have a whole entire day to steal money from your friends and family.
So if your into games that are meant to scare you, but really don't, Dead Space may be for you. But if you can't handle the site of limbs flying off and mutant babies then you should probably back off this deal. Steam overall is offering a better deal.