I have the retail version of Arma 2 so I was looking for a deal on OA.
For Day Z you can use ArmA 2: Free, but the textures will be bad and I've read some people think it causes bugs.
This version works perfectly. I got it up and running and played it for about an hour last night.
greenmangaming has it for $15 on sale as well.
Edited by V4oLDbOY, 16 May 2012 - 01:31 AM.