expired Bioshock $5 and Bioshock 2 $12.50 USD on Steam
This was posted 1 year 6 months 27 days ago, and might be an out-dated deal
Saw this on Steam's website a couple of days ago. Not the first time it's gone down to $5 but nevertheless, still a pretty good deal. Get it, hook your comp up to a 50-inch tv, and sit five feet away.
EDIT: the $4.99 price tag for Bioshock 2 is US ONLY. AU's price is $12.49. Bioshock still remains at $4.99.