alright I think i have worked out a way to get some monies!
I present: overly complicated and brain-frying, Currency Trading!
Theres probably many more irregularities in the market, but this one was the most obvious
lets say 1 of A turns into 1 of B
lets say 10 g turns into 1 A
lets say 1 B turns into 15 g (any number more than what 1A becomes)
so you make 10 B into 150 gold
150 gold into 15 A
15 A into 15 B
and 15 B into 225 gold
( until the person selling any one of those things runs out of them )