It depends on how much you want it. I think anything > $1,000 would be fair for that bag. But you can only make 1 offer (through Ebay), so make it your best offer.
She is so nice!
I almost bought this from her...she offered it to me for $1195... a little on the high side I think but I would have paid it... but then I decided I like the City more than the Purse (another story!)