Greg,
I was in a similar position a few weeks ago and did a lot of shopping around. One or two fellow members got in touch and I ended up buying mine from the lovely Bev Downey - I'm delighted with it!
If nobody on the forum can help there are some used bargains in the shops.
www.apertureuk.com have one at the minute described as Mint- at £690. I have used them before and they seem reliable.My local CEX has one at £625 with a full years warranty. When it disappeared off the shelf for a few days I enquired about it and was told it was an internet sale which was returned as part of their internet sales policy (so even though it's in N.Ireland it is not inaccessible). They may be marginally more expensive than a private sale, but still cheaper than eBay!
Alan