Sleeping Dogs on sale at Green Man Gaming for $16.99.
Link:
http://www.greenmangaming.com/s/us/en/pc/games/action/sleeping-dogs-digital-edtition-na/
Use code:
GMG20-1FYLZ-EDG8R
at check out for an additional 20% off bringing the grand total to $13.60, this is the cheapest I've seen this game...