Amazon has stopped selling the electronic version of SimCity after numerous problems with the launch. The physical copy of the game is still for sale, and the digital one should return once the connectivity problems are resolved by EA and Maxis.
When either copy is selected for purchase, a warning is displayed:
Important Note on "SimCity": Many customers are having issues connecting to the "SimCity" servers. EA is actively working to resolve these issues, but at this time we do not know when the issue will be fixed. Please visit https://help.ea.com/en/simcity/simcity for more information.
The SimCity launch is starting to match the scale of problems that the Diablo III launch underwent last May. This should be yet another nail in the coffin for always-on games and DRM, but we doubt it will have much effect. EA has disabled certain non-critical features to help with connectivity problems and plans to bring more servers online. They've also said customers can request a refund, though not everyone is having success at getting one.