Lamp oil is a common trade item in Hyrule. Sadly only Morshu has Lamp Oil, wich is a shame for princess zelda.
Lamp oil outsold the WiiU in the 2016 fiscal year. But due to the hype of Call of Theft Duty V. Lamp oil has seen a staggering decline in the past century
Morshu has a monopoly on Lamp oil, and wont let anyone else have it, except link because he is the only one with rubies.