I have been trying to sell this thing for a year and its turning out to be a BIG PAIN IN THE A**. So I saw "pinksage" sold one a couple months ago for $800. Mine is not factory sealed, but I practically never touched anything except the game its self. So I'd say that $450 is a reasonable price for this one of a kind CE.
For Sale
Title:Dead Space Ultra Limited Edition
Platform:Xbox 360
Region:US NTSC
Price:$450 USD
Condition:New
Detail Conditions:All sealing is gone but brand new still, there are 4 tac sized holes on either corner of the lithograph when I put it on my wall
Link to DB Entry:http://collectorsedition.org/game-db...ition-360-ntsc
and the pics are below in my reply, now its easier to see