Grand Strategy fanatics will have probably already delved into this exceptionally deep take on the genre, which received rave reviews and is generally considered to be the best in the venerable series. Indulge in true exploration, trade, in-depth diplomacy and, when all else fails, all-out warfare.
If not, though, this is the one of the cheapest prices we've ever seen! Bear in mind that it's on Amazon.com, though, so you'll need to register an account with a US postal address. The key will be delivered by email, though, so don't worry. Thanks for the tip, gooner!