Items and cards use different vendors
Zuka sells recovery and utility items. The checked list includes Egg at 35 TIX and First Aid Kit at 75 TIX. The Wealthy Merchant sells cards; compare the actual card name before spending on a similarly named item.
Optional boss access
Finn McCool is south of the village and becomes available after the Chapter 4 clear. If he is your goal, finish The Ancients first. Finn awards Aggressor and Converging Timelines.
Before returning to the dungeon
Use the village’s inn for recovery and finish shopping before leaving. A reserve item should match your problem: the First Aid Kit revives, while an SP item restores action resources. They are not interchangeable.