Current status
0.4.5 · fixedThe cart-purchasing issue was fixed; the patch states that players can purchase as many carts as they like. This does not mean carts are free or that all destinations have identical inventory.
What to check in your save
Inspect the purchase offer and your funds. Report the exact screen and save if the old purchasing restriction persists.
Version boundaries
The patch lists the issue as fixed. A similar symptom on a newer build needs a fresh reproduction instead of a claim that the old defect is still universally active.
Record the installed build, selected character or building, city and action. Preserve a save before trying a destructive workaround. Prepare a useful bug report ↗