They come in at just over £1k new, not sure if that's including vat or not. I just paid £750 for mine used but it still has all it's paint so hasn't done much.
This one is made in Italy and imported by Riko UK. There are a few makes out there, some with screw or hydraulic splitters built in too and the top of the range also have a conveyor so you can feed what you've cut and split straight into the bed of your pickup or a trailer.
With a big engine like a mog it'll cut even faster than it does in the video. You can hear the tractor engine strain a little which allows the blade to slow. Keep them running flat out and they fly through the wood like a hot knife through butter.