Mine cost £55 plus the customs charge when it arrived in the UK (I think somewhere between £10 and £15).
The power and audio going down the same cable was my main concern but after numerous e-mails I decided to give it a try and there's no problem with noise (I'm using a Dunlop Brick on the pedal board). Maybe it's because it's not mains power going down it but I'm no expert.
It's actually a lot simpler - The pedal snake stays connected to the pedal board and just coils up on top of it when it goes in the case. The only things to disconnect are two jack plugs at the amp end and the power connection. Much better than having a power cable, an audio cable and a foot switch cable all over the stage.
I don't think it would be worth getting one for home or studio but they're great for live work.