Andy,
The cost can vary. New it sells for around $5,900, but realistically you'd be looking closer to $6,500 after a mount and some extra-long cables. It is technically a pre-amp stage, so it would require both an amplifier & speakers to work. B&O speakers are self amplified and connect directly to the system, but a B&O amp (ML/MCL Converter for about $500) or another 3rd party amp could also work. The likelihood of getting a truly smokin' deal is probably a few years off as it's only just been launched.
There is scarcely anything in this world that some man cannot make a little worse and sell a little more cheaply. The person who buys on price alone is this man's lawful prey. - John Ruskin