I think this threads been very interesting. There is a vast array of prices but I think it would give a general idea of cost so if someone is offered a pup significantly lower or higher in price for unexplained/unquantified reasons it might just ring an alarm bell.
Barney cost me £550 last May.
For interest:
My Labrador cost me £400 in 2004 (subsequently discovered she's not very well bred which made me sooo much more careful with my future pups!)
My Golden Retriever cost me £550 in 2005
My American Cocker cost me £500 a few weeks ago (discounted friends rate!)
We're in the north of England.