They’re $500 for standard reticles and $900 for Horus.
It would depend what you currently have and what it is you want as to whether you’d be better off to have it swapped, or sell and buy. There are bargains on used S&B’s.
Yeah it can be. The cost is understandable. Super-high precision parts that must be replaced and recalibrated on high-end proprietary German-made instruments.