Dead Space 2 is $14.99 on D2D. Using a 15% off code brings it down to 12.75. I believe it should register on Origin if you prefer a Steamlike client.
http://www.direct2drive.com/10210/product/Buy-Dead-Space-2-Download
15% off code: 42B92ABCFED171E18A46C1ECB4D95B6F
Note: This is my referral...