Ultima Underworld 2 - Labyrinth of Worlds

Unlimited scrolls and potions:
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Use a fireball spell on a potion or scroll. Collect 
the remnants of the destroyed item and use it. 
The remnants will have the same effect as the original 
potion or scroll and may be used an unlimited amount 
of time. 

Free Gold: 
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If you ever need more money, find someone who you can 
barter with. If they have any money, they will give all 
their gold for one gold piece. (Example-13 gold traded 
for 1 gold piece) The NPC's always accept the trade.