For anyone that may have missed all of the past deals on BF3 and may still be interested in getting into it even with BF4 about to be released, Origin has the Premium Edition on sale right now.  This includes the base game and all of the expansions, plus it will guarantee that you get in on the open beta of BF4.

https://www.origin.com/en-us/store/buy/battlefield-3/pc-download/bundle/premium-edition?sourceid=Origin_AFF_LS315&c=Es5Ekr9eEBk&LSsiteID=Es5Ekr9eEBk-_8iGMgkzeJmBbI60jY_ZTw