I recommend buying off ebay. The things dont come up often but when they do its usually as an unwanted gift or tried once and not my scene thing so the sysyems are in effect brand new. Price onviouly varies from auction to auction but fot what would be a £1500 new system you can pay as little as £700. I bought on 18 months ago this way and got mine for £650.
A new Sybian is about $1400 plus shipping. No distributor offers ANY discounts and neither does the manufacturer. You might get a reconditioned one that was returned with new attachments but you will not save much for doing so. They reportedly last nearly for ever and never break down so the only way you will save anything is to buy a used one.