Of course we all want to get the best deal possible on a home, just keep in mind you will need patience to close a short sale transaction!
Good question. Actually, no - there's no standard they're willing to lose by. That would be considered price fixing, or could be perceived that way, which is unlawful according to the anti-trust laws. The price is ALWAYS set by the market. If you're not yet working with a buyer's agent, I would suggest you agree to be represented by one. They'll have the most knowledge and the best negotiating skills to get you the property at the lowest price possible.