I negotiate all day for a living. If someone doesn't want to make the effort in coming to look at your vehicle your selling in person typically no matter how much of a discount you give them they wont show. If you go in person be prepared to walk away empty handed. The more intrested you show the higher chances you wont get a discount unless the seller is desperate. Everytime I've bought anything I've got a discount no matter if their original prices were "firm"