Have you tried doing a completed listings search? I've just done one and the highest price was just over £150 for a very nice looking Rolleicord Vb with case and the original box, manual and guarantee card. At the bottom of the price range it is often hard to know whether something is working or not - buyers cover themselves by disclaiming any knowledge whatsoever. You'll need to have a browse yourself.
I quite fancy a TLR myself. A new Rolleiflex is over £2,000, so I won't be getting one of those...
Thomsk