The literature says to run it on 9V, but it supposedly sounds *amazing* on 12V... They are big and ugly, but kind of cool at the same time. The only one I've had use of only worked intermittently. I still have to get around to fixing it...
I've seen them sell for as little as USD 120. But they are one of those wierd rare items that the price fluctuates for... so as Zerksies says, you may find people want USD 250 - there's one on a Japanese eBay seller's site at the moment for about that (these guys are always expensive, so you could consider that price to be an upper limit).
Wouldn't have a clue on a price Goran but your long enough haggling for gear to know how to get a good bargain.......the chorus sound is excellent... also those weird 'pac-man'(for those of you old enough to remember pac-man... ) noises he got out of it were kinda cool as well...the flanging sounded similar to the BF-2....