There is quite a few used car dealers here in Australia that have huge warehouses full of cars and they make it clear there is no price negotiations. They do have good prices though but no vehicles older than ten years and no trade ins. For trucks though there is usually a fair bit of room to negotiate. Last truck i bought i got $2000 off, he wouldn't go any lower. I told him if they added another fuel tank he had a deal, he said no so i walked, made it to car park before he called me back and said "boss" had ok'd it. Just the games they like to play, you have to play along.