I guess that spending money is tight though out the world at this point in time. Everyone is trying to get the best price when selling their bikes. As with the buyer, who is also in the same boat, trying to get a bike for the best price. Since money is tight, argue a discount / a better price with the seller. While the bike stands there, the seller is at a disadvantage in that what ever the seller needs the money for, may be slipping though his fingers.
As far as a average price is concerned, phone a few dealers for the book / trade-in price and compare this figure to the "for sale" websites. This will help with an indication of what a good price is. Remember to ask for the service history, etc and take it for a long test ride. Hope you get the bike for the price that you are willing to pay. Good luck