Quoted from Rdoyle1978:

If a buyer comes at you with “what’s your best bottom number” then that’s not making a deal. That’s them trying to convince themselves they can afford this thing. In other words, a tire kicker. Occasionally that does turn into a sale, but usually that sort of opening raises all kinds of alarm bells for me.
I respond in general with “the price you see is the price im looking for”, which is true. If the buyer comes out and they spot something i missed, or was otherwise not disclosed, then I’ll budge. If I’m a hundred bucks off my sale price, ok then fine, but you get there by putting in the work, not by trying to get the best deal in the world and not bring anything to the table.