choice of stepper motors (no replies)

I always find 42 stepper motor for x and y axis,
I am wondering if this is necessary to have such large motor for lightweight motion such as x and y axis,

If there is any choice for smaller stepper motor?
Does smaller mean cheaper as well?
Does it have to be compatible to motor driver as well, as far as I know most mainboard are using A4988 or DRV8825?

Thanks