I got the item when going to a discovery site, by drawing "random item", so not a settlement of any kind, and to my understanding, you don't roll for price tables unless you're in a settlement? Would that mean that it should have cost 4 coins?
I didn't have any coins when I made my way there so I couldn't have collected it anyway, but if it had happened earlier, would the item still be there to collect later if I made my way back?