I tend to get out of the blue requests for me to give deep discounts on my shop prices. Although it's something I don't really want to get into, I usually end up setting up a trade anyway... to end up either being ghosted or told by the buyer that someone got back to them faster. So I want to propose a button or bright-colored badge be put on each shop that would indicate quickly (maybe shows on front page or something) whether that shop owner accepts haggling or not.

Could be useful for trades too.

Really like this idea!

Absolutely. I'm open to haggling on unpriced items, but I don't want to change my shop names to HAGGLING IS FINE.