I see! Then I can offer you something cheap! Antidote fruits are 1 large copper coin at miscellany shops, but I'll give it to you for 5 coppers! The map is 3 silvers but I'll sell you for 1 silver!"
They're certainly cheap.
Furthermore, the price of the map is just like the oneesan at the counter said earlier, strangely, this guy doesn't lie.
If it's like this, then I wonder if I should buy something.
"You'll really sell them for 5 coppers and 1 silver?"