Can also be Certificate Authority. That would have a better ring to it.

First time i see CA used for central asia, and i live in asia :)

Let's say you have two options: (a) costs X, lasts for Y (b) costs X*3 but lasts for Y*5 - then you still get more value for money with option (b). The tricky thing is of course that it's hard to tell how long something will last, but generally if something is very cheap, it's unlikely to be of high enough quality.