Well, if you want just After Effects CC 2014, it is $20 per month. To get After Effects and Premiere Pro would be $40. But getting everything, almost all of the Adobe products, is only $10 more for a total of $50.
If you are in the USA. Otherwise it can be much more expensive.
To buy After Effects CS6 to work with your Premiere Pro CS6, it would cost around $900.