Amazon is currently running a $20 off Dead Space 2 promotion, applies to all systems and versions.
Collectors Edition - 59.95
http://www.amazon.com/Dead-Space-2-...DJAI/ref=sr_1_5?ie=UTF8&qid=1297117500&sr=8-5
http://www.amazon.com/Dead-Space-2-...617Q/ref=sr_1_4?ie=UTF8&qid=1297117500&sr=8-4
http://www.amazon.com/Dead-Space-2-...7XUK/ref=sr_1_6?ie=UTF8&qid=1297117500&sr=8-6
Regular Edition - 39.99
http://www.amazon.com/Dead-Space-2-Xbox-360/dp/B00309U0M6/ref=sr_1_1?ie=UTF8&qid=1297117500&sr=8-1
http://www.amazon.com/Dead-Space-2-...XHD0/ref=sr_1_2?ie=UTF8&qid=1297117500&sr=8-2
http://www.amazon.com/Dead-Space-2-Pc/dp/B002I0HJ68/ref=sr_1_3?ie=UTF8&qid=1297117500&sr=8-3
Collectors Edition - 59.95
http://www.amazon.com/Dead-Space-2-...DJAI/ref=sr_1_5?ie=UTF8&qid=1297117500&sr=8-5
http://www.amazon.com/Dead-Space-2-...617Q/ref=sr_1_4?ie=UTF8&qid=1297117500&sr=8-4
http://www.amazon.com/Dead-Space-2-...7XUK/ref=sr_1_6?ie=UTF8&qid=1297117500&sr=8-6
Regular Edition - 39.99
http://www.amazon.com/Dead-Space-2-Xbox-360/dp/B00309U0M6/ref=sr_1_1?ie=UTF8&qid=1297117500&sr=8-1
http://www.amazon.com/Dead-Space-2-...XHD0/ref=sr_1_2?ie=UTF8&qid=1297117500&sr=8-2
http://www.amazon.com/Dead-Space-2-Pc/dp/B002I0HJ68/ref=sr_1_3?ie=UTF8&qid=1297117500&sr=8-3