damn... well, right now it's $15... I am gonna miss it though. I bought STALKER: Shadow of Chernobyl on special, I was itching to get it for months and then w000t $7. Best seven bux I ever spent.
I have had a little play with it. I was hoping the AI had been optimised compared to civ4 and 5, (civ4 uses python AI, btw, if you are into ML). Nope, too slow for my 110 euro second hand old laptop. Hopefully when I have a good enough computer to play it, I don't mind the 60 bux to buy it. It looks like fun.
STALKER - Forever!!! =)