I see your bacon and raise you one egg

Random thought for the day, while I wait for my remote-desktop TI to send several hundred emails:

Every so often I think how cool it would be if we had a society in which negotiating and bargaining was an accepted form of economic exchange. My particular version today is that I'm sitting in Oddfellows, having very lovely tea and a tasty breakfast pannini with cheddar and bacon and tomato and egg on top (yum). It's really delicious, and I will be the first to tell you that I really enjoy bacon on my breakfast. However this bacon is pretty salty, and I'm not too fussed about bacon this morning; I would be happy to have the sandwich without it.
So wouldn't it be nifty if it was totally acceptable to just go up to order and say, Hey, I'd like the breakfast sandwich but without bacon for two dollars less, and then the cashier would say, Okay, but how about this other price, and then we'd negotiate based on whatever the price of bacon was that day.
Maybe I'm weird, but I think that would be pretty cool.