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For those of you waiting for a good deal on Civ5 this is probably the best price you can get it.
Civ5 GoTY (includes some DLC) for $12.50 and $7.50 for the regular edition.
All the Civ5 stuff falls under that -75% so that goes for DLC too.
I got mine when it first came out at full price but I got more than my monies worth. With the sale the entertainment hours per $ would be much higher.