No longer a BBag virgin... My Black City is coming!!

i love it! i really want to get a bbag too... but i'm a newbie to balenciaga, so i need some guidance.

is black a standard color that all bags come in, or do the colors change each season? i really want a black first. btw, i don't even know if the first comes in black but i'm thinking it does since black is such a standard color. how much are they, anyways?