Price it. And if I try to negotiate, and you act like a child, I Will never ever return. We are all adults. Any seller, (myself included) who has been selling for any time knows you will get lowballers & negotiators. EXPECT it. Price for it. DEAL WITH IT. STOMP a can...real nice. My last show I had a great Buick sign, and the guy offered me half of what I priced, because he saw one last week at that offered price. I simply stated, "Bet you wish you bought that other sign now, don't ya?"
I have been selling signs & hit & miss engine stuff for years. Enjoy the show, enjoy the crowd, and have a good time. No need turning people away from the hobby.