You can grab the Gods and Kings expansion for Civ 5 on Greenman Gaming for $3.15.
http://www.greenmangaming.com/s/us/en/pc/games/strategy/sid-meiers-civilization-v-gods-kings/
Use code GMG30-DPLIM-DN831
http://www.greenmangaming.com/s/us/en/pc/games/strategy/sid-meiers-civilization-v-gods-kings/
Use code GMG30-DPLIM-DN831