If you missed yesterday's steam daily sales, Amazon has some of them still on sales!
Duke Nukem Forever - $5
http://amzn.to/s3Jfsj
Tropico 4 - $5 (not Steam compatible)
http://amzn.to/uqmz4m
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SuperNiceDog recommends the following SuperNiceGame:
http://amzn.to/tOv1Xr