I got mine on eBay 350 but you need a 5kv tranny also had to adapt my victor drive board with a boss off eBay to fit as they wanted 150 for board only. Altogether cost me 400 but brilliant machine and very weighty. Have a look on eBay that's the best place.
One is £700, the other is £950 buy it now on eBay. Buy the time i buy the driveboard and pay delivery, might as well ont the extra for a brand new nilfisk!
Thats what I did. Most on ebay, are ex hire shop, and have been battered. If you keep looking, eventually a bargain will come up though.
should have some soon on trade shop. Around £1400 brand new with drive board, segments for grinding, polishing etc.